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    CVE-2007-3847

    The date handling code in modules/proxy/proxy_util.c (mod_proxy) in Apache 2.3.0, when using a threaded MPM, allows remote origin servers to cause a denial of service (caching forward proxy process crash) via crafted date headers that trigger a buffer over-read.

    Published:Aug 1, 2007
    Last Modified:Apr 23, 2026
    EPS:Aug 23, 2007
    EPSS Score:0.23276
    CVSS Score:5

    Affected Products

    Vendor
    Apache
    Product
    Http Server
    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Fedoraproject
    Product
    Fedora Core
    Vendor
    Redhat
    Product
    Certificate System
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Application Stack

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-48913 (CVSS 7.3) — Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. …
    CVE-2026-42536 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted…
    CVE-2026-44185 (CVSS 7.3) — Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP…
    CVE-2026-34355 (CVSS 7.5) — A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted …
    CVE-2026-44631 (CVSS 9.8) — Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. Th…
    CVE-2026-44119 (CVSS 5.5) — Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess au…
    CVE-2026-43951 (CVSS 6.5) — Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response lan…
    CVE-2026-42535 (CVSS 9.1) — A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly ma…
    CVE-2026-34356 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassRev…
    CVE-2026-44186 (CVSS 7.3) — Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTT…

    References

    http://bugs.gentoo.org/show_bug.cgi?id=186219
    http://docs.info.apple.com/article.html?artnum=307562
    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01182588
    http://httpd.apache.org/security/vulnerabilities_20.html
    http://httpd.apache.org/security/vulnerabilities_22.html
    http://lists.apple.com/archives/security-announce/2008//May/msg00001.html
    http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
    http://lists.vmware.com/pipermail/security-announce/2009/000062.html
    http://marc.info/?l=apache-cvs&m=118592992309395&w=2
    http://marc.info/?l=apache-httpd-dev&m=118595556504202&w=2
    http://marc.info/?l=apache-httpd-dev&m=118595953217856&w=2
    http://secunia.com/advisories/26636
    http://secunia.com/advisories/26722
    http://secunia.com/advisories/26790
    http://secunia.com/advisories/26842
    http://secunia.com/advisories/26952
    http://secunia.com/advisories/26993
    http://secunia.com/advisories/27209
    http://secunia.com/advisories/27563
    http://secunia.com/advisories/27593
    http://secunia.com/advisories/27732
    http://secunia.com/advisories/27882
    http://secunia.com/advisories/27971
    http://secunia.com/advisories/28467
    http://secunia.com/advisories/28606
    http://secunia.com/advisories/28749
    http://secunia.com/advisories/28922
    http://secunia.com/advisories/29420
    http://secunia.com/advisories/30430
    http://security.gentoo.org/glsa/glsa-200711-06.xml
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.595748
    http://support.avaya.com/elmodocs2/security/ASA-2007-500.htm
    http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg27007951
    http://www-1.ibm.com/support/docview.wss?uid=swg1PK50469
    http://www-1.ibm.com/support/docview.wss?uid=swg1PK52702
    http://www.fujitsu.com/global/support/software/security/products-f/interstage-200802e.html
    http://www.mandriva.com/security/advisories?name=MDKSA-2007:235
    http://www.novell.com/linux/security/advisories/2007_61_apache2.html
    http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.html
    http://www.redhat.com/archives/fedora-package-announce/2007-September/msg00320.html
    http://www.redhat.com/support/errata/RHSA-2007-0746.html
    http://www.redhat.com/support/errata/RHSA-2007-0747.html
    http://www.redhat.com/support/errata/RHSA-2007-0911.html
    http://www.redhat.com/support/errata/RHSA-2008-0005.html
    http://www.securityfocus.com/archive/1/505990/100/0/threaded
    http://www.securityfocus.com/bid/25489
    http://www.securitytracker.com/id?1018633
    http://www.ubuntu.com/usn/usn-575-1
    http://www.us-cert.gov/cas/techalerts/TA08-150A.html
    http://www.vupen.com/english/advisories/2007/3020
    http://www.vupen.com/english/advisories/2007/3095
    http://www.vupen.com/english/advisories/2007/3283
    http://www.vupen.com/english/advisories/2007/3494
    http://www.vupen.com/english/advisories/2007/3955
    http://www.vupen.com/english/advisories/2008/0233
    http://www.vupen.com/english/advisories/2008/0924/references
    http://www.vupen.com/english/advisories/2008/1697
    https://issues.rpath.com/browse/RPL-1710
    https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r652fc951306cdeca5a276e2021a34878a76695a9f3cfb6490b4a6840%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rafd145ba6cd0a4ced113a5823cdaff45aeb36eb09855b216401c66d6%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/reb542d2038e9c331506e0cbff881b47e40fbe2bd93ff00979e60cdf7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10525
    https://www.redhat.com/archives/fedora-package-announce/2007-September/msg00353.html
    http://bugs.gentoo.org/show_bug.cgi?id=186219
    http://docs.info.apple.com/article.html?artnum=307562
    http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01182588
    http://httpd.apache.org/security/vulnerabilities_20.html
    http://httpd.apache.org/security/vulnerabilities_22.html
    http://lists.apple.com/archives/security-announce/2008//May/msg00001.html
    http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
    http://lists.vmware.com/pipermail/security-announce/2009/000062.html
    http://marc.info/?l=apache-cvs&m=118592992309395&w=2
    http://marc.info/?l=apache-httpd-dev&m=118595556504202&w=2
    http://marc.info/?l=apache-httpd-dev&m=118595953217856&w=2
    http://secunia.com/advisories/26636
    http://secunia.com/advisories/26722
    http://secunia.com/advisories/26790
    http://secunia.com/advisories/26842
    http://secunia.com/advisories/26952
    http://secunia.com/advisories/26993
    http://secunia.com/advisories/27209
    http://secunia.com/advisories/27563
    http://secunia.com/advisories/27593
    http://secunia.com/advisories/27732
    http://secunia.com/advisories/27882
    http://secunia.com/advisories/27971
    http://secunia.com/advisories/28467
    http://secunia.com/advisories/28606
    http://secunia.com/advisories/28749
    http://secunia.com/advisories/28922
    http://secunia.com/advisories/29420
    http://secunia.com/advisories/30430
    http://security.gentoo.org/glsa/glsa-200711-06.xml
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.595748
    http://support.avaya.com/elmodocs2/security/ASA-2007-500.htm
    http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg27007951
    http://www-1.ibm.com/support/docview.wss?uid=swg1PK50469
    http://www-1.ibm.com/support/docview.wss?uid=swg1PK52702
    http://www.fujitsu.com/global/support/software/security/products-f/interstage-200802e.html
    http://www.mandriva.com/security/advisories?name=MDKSA-2007:235
    http://www.novell.com/linux/security/advisories/2007_61_apache2.html
    http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.html
    http://www.redhat.com/archives/fedora-package-announce/2007-September/msg00320.html
    http://www.redhat.com/support/errata/RHSA-2007-0746.html
    http://www.redhat.com/support/errata/RHSA-2007-0747.html
    http://www.redhat.com/support/errata/RHSA-2007-0911.html
    http://www.redhat.com/support/errata/RHSA-2008-0005.html
    http://www.securityfocus.com/archive/1/505990/100/0/threaded
    http://www.securityfocus.com/bid/25489
    http://www.securitytracker.com/id?1018633
    http://www.ubuntu.com/usn/usn-575-1
    http://www.us-cert.gov/cas/techalerts/TA08-150A.html
    http://www.vupen.com/english/advisories/2007/3020
    http://www.vupen.com/english/advisories/2007/3095
    http://www.vupen.com/english/advisories/2007/3283
    http://www.vupen.com/english/advisories/2007/3494
    http://www.vupen.com/english/advisories/2007/3955
    http://www.vupen.com/english/advisories/2008/0233
    http://www.vupen.com/english/advisories/2008/0924/references
    http://www.vupen.com/english/advisories/2008/1697
    https://issues.rpath.com/browse/RPL-1710
    https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r652fc951306cdeca5a276e2021a34878a76695a9f3cfb6490b4a6840%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rafd145ba6cd0a4ced113a5823cdaff45aeb36eb09855b216401c66d6%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/reb542d2038e9c331506e0cbff881b47e40fbe2bd93ff00979e60cdf7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10525
    https://www.redhat.com/archives/fedora-package-announce/2007-September/msg00353.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High