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    CVE-2002-0839

    The shared memory scoreboard in the HTTP daemon for Apache 1.3.x before 1.3.27 allows any user running as the Apache UID to send a SIGUSR1 signal to any process as root, resulting in a denial of service (process kill) or possibly other behaviors that would not normally be allowed, by modifying the parent[].pid and parent[].last_rtime segments in the scoreboard.

    Published:Oct 3, 2002
    Last Modified:Apr 16, 2026
    EPS:Oct 5, 2002
    EPSS Score:0.00141
    CVSS Score:7.2

    Affected Products

    Vendor
    Apache
    Product
    Http Server
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Linux
    Vendor
    Redhat
    Product
    Rhel Stronghold
    Vendor
    Redhat
    Product
    Stronghold

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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

    ftp://patches.sgi.com/support/free/security/advisories/20021105-01-I
    http://archives.neohapsis.com/archives/bugtraq/2002-10/0195.html
    http://archives.neohapsis.com/archives/bugtraq/2002-10/0254.html
    http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0012.html
    http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000530
    http://marc.info/?l=apache-httpd-announce&m=103367938230488&w=2
    http://marc.info/?l=bugtraq&m=103376585508776&w=2
    http://marc.info/?l=bugtraq&m=130497311408250&w=2
    http://online.securityfocus.com/advisories/4617
    http://www.apacheweek.com/issues/02-10-04
    http://www.debian.org/security/2002/dsa-187
    http://www.debian.org/security/2002/dsa-188
    http://www.debian.org/security/2002/dsa-195
    http://www.iss.net/security_center/static/10280.php
    http://www.linux-mandrake.com/en/security/2002/MDKSA-2002-068.php
    http://www.linuxsecurity.com/advisories/other_advisory-2414.html
    http://www.securityfocus.com/bid/5884
    https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r8c9983f1172a3415f915ddb7e14de632d2d0c326eb1285755a024165%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/rd00b45b93fda4a5bd013b28587207d0e00f99f6e3308dbb6025f3b01%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf2f0f3611f937cf6cfb3b4fe4a67f69885855126110e1e3f2fb2728e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    ftp://patches.sgi.com/support/free/security/advisories/20021105-01-I
    http://archives.neohapsis.com/archives/bugtraq/2002-10/0195.html
    http://archives.neohapsis.com/archives/bugtraq/2002-10/0254.html
    http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0012.html
    http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000530
    http://marc.info/?l=apache-httpd-announce&m=103367938230488&w=2
    http://marc.info/?l=bugtraq&m=103376585508776&w=2
    http://marc.info/?l=bugtraq&m=130497311408250&w=2
    http://online.securityfocus.com/advisories/4617
    http://www.apacheweek.com/issues/02-10-04
    http://www.debian.org/security/2002/dsa-187
    http://www.debian.org/security/2002/dsa-188
    http://www.debian.org/security/2002/dsa-195
    http://www.iss.net/security_center/static/10280.php
    http://www.linux-mandrake.com/en/security/2002/MDKSA-2002-068.php
    http://www.linuxsecurity.com/advisories/other_advisory-2414.html
    http://www.securityfocus.com/bid/5884
    https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r8c9983f1172a3415f915ddb7e14de632d2d0c326eb1285755a024165%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/rd00b45b93fda4a5bd013b28587207d0e00f99f6e3308dbb6025f3b01%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf2f0f3611f937cf6cfb3b4fe4a67f69885855126110e1e3f2fb2728e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E

    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