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    CVE-2006-5974

    fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote attackers to cause a denial of service (crash) via unknown vectors that trigger a NULL pointer dereference when calling the (1) ferror or (2) fflush functions.

    Published:Dec 31, 2006
    Last Modified:Apr 23, 2026
    EPS:Jan 9, 2007
    EPSS Score:0.13761
    CVSS Score:7.8

    Affected Products

    Vendor
    Fetchmail
    Product
    Fetchmail

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2025-61962 (CVSS 5.9) — In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a…
    CVE-2021-39272 (CVSS 5.9) — Fetchmail before 6.4.22 fails to enforce STARTTLS session encryption in some circumstances, such as a certain …
    CVE-2021-36386 (CVSS 7.5) — report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list a…
    CVE-2012-3482 (CVSS 5.8) — Fetchmail 5.0.8 through 6.3.21, when using NTLM authentication in debug mode, allows remote NTLM servers to (1…
    CVE-2011-1947 (CVSS 5) — fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS …
    CVE-2010-1167 (CVSS 4.3) — fetchmail 4.6.3 through 6.3.16, when debug mode is enabled, does not properly handle invalid characters in a m…
    CVE-2010-0562 (CVSS 6.8) — The sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13, when running in verbose mode on platfor…
    CVE-2009-2666 (CVSS 6.4) — socket.c in fetchmail before 6.3.11 does not properly handle a '\0' character in a domain name in the subject'…
    CVE-2008-2711 (CVSS 4.3) — fetchmail 6.3.8 and earlier, when running in -v -v (aka verbose) mode, allows remote attackers to cause a deni…
    CVE-2007-4565 (CVSS 5) — sink.c in fetchmail before 6.3.9 allows context-dependent attackers to cause a denial of service (NULL derefer…

    References

    http://fedoranews.org/cms/node/2429
    http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
    http://osvdb.org/31836
    http://secunia.com/advisories/23631
    http://secunia.com/advisories/23804
    http://secunia.com/advisories/23838
    http://secunia.com/advisories/23923
    http://secunia.com/advisories/24151
    http://security.gentoo.org/glsa/glsa-200701-13.xml
    http://securitytracker.com/id?1017479
    http://slackware.com/security/viewer.php?l=slackware-security&y=2007&m=slackware-security.517995
    http://www.novell.com/linux/security/advisories/2007_4_sr.html
    http://www.openpkg.com/security/advisories/OpenPKG-SA-2007.004.html
    http://www.securityfocus.com/archive/1/456114/100/0/threaded
    http://www.securityfocus.com/bid/21902
    http://www.trustix.org/errata/2007/0007
    http://www.vupen.com/english/advisories/2007/0087
    http://www.vupen.com/english/advisories/2007/0088
    http://fedoranews.org/cms/node/2429
    http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
    http://osvdb.org/31836
    http://secunia.com/advisories/23631
    http://secunia.com/advisories/23804
    http://secunia.com/advisories/23838
    http://secunia.com/advisories/23923
    http://secunia.com/advisories/24151
    http://security.gentoo.org/glsa/glsa-200701-13.xml
    http://securitytracker.com/id?1017479
    http://slackware.com/security/viewer.php?l=slackware-security&y=2007&m=slackware-security.517995
    http://www.novell.com/linux/security/advisories/2007_4_sr.html
    http://www.openpkg.com/security/advisories/OpenPKG-SA-2007.004.html
    http://www.securityfocus.com/archive/1/456114/100/0/threaded
    http://www.securityfocus.com/bid/21902
    http://www.trustix.org/errata/2007/0007
    http://www.vupen.com/english/advisories/2007/0087
    http://www.vupen.com/english/advisories/2007/0088

    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