fetchmail 6.3.8 and earlier, when running in -v -v (aka verbose) mode, allows remote attackers to cause a denial of service (crash and persi
fetchmail 6.3.8 and earlier, when running in -v -v (aka verbose) mode, allows remote attackers to cause a denial of service (crash and persistent mail failure) via a malformed mail message with long headers, which triggers an erroneous dereference when using vsnprintf to format log messages.
- Published
- Jun 16, 2008
- Updated
- Jun 16, 2026
- EPSS
- 3.0% · 87th percentile
- CWE
- CWE-20
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.0%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| fetchmail | fetchmail | cpe:2.3:a:fetchmail:fetchmail |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fetchmail fetchmailup to 6.3.8 inclusive
- fetchmail fetchmail4.5.1
- fetchmail fetchmail4.5.2
- fetchmail fetchmail4.5.3
- fetchmail fetchmail4.5.4
- fetchmail fetchmail4.5.5
- fetchmail fetchmail4.5.6
- fetchmail fetchmail4.5.7
- fetchmail fetchmail4.5.8
- fetchmail fetchmail4.6.0
- fetchmail fetchmail4.6.1
- fetchmail fetchmail4.6.2
- fetchmail fetchmail4.6.3
- fetchmail fetchmail4.6.4
- fetchmail fetchmail4.6.5
- fetchmail fetchmail4.6.6
- fetchmail fetchmail4.6.7
- fetchmail fetchmail4.6.8
- fetchmail fetchmail4.6.9
- fetchmail fetchmail4.7.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | fetchmail | before 6.3.9~rc2-1 | 6.3.9~rc2-1 |
| Red Hat:enterprise_linux:3::as | fetchmail | before 0:6.2.0-3.el3.5 | 0:6.2.0-3.el3.5 |
| Red Hat:enterprise_linux:3::as | fetchmail-debuginfo | before 0:6.2.0-3.el3.5 | 0:6.2.0-3.el3.5 |
| Red Hat:enterprise_linux:4::as | fetchmail | before 0:6.2.5-6.0.1.el4_8.1 | 0:6.2.5-6.0.1.el4_8.1 |
| Red Hat:enterprise_linux:4::as | fetchmail-debuginfo | before 0:6.2.5-6.0.1.el4_8.1 | 0:6.2.5-6.0.1.el4_8.1 |
| Red Hat:enterprise_linux:5::client_workstation | fetchmail | before 0:6.3.6-1.1.el5_3.1 | 0:6.3.6-1.1.el5_3.1 |
| Red Hat:enterprise_linux:5::client_workstation | fetchmail-debuginfo | before 0:6.3.6-1.1.el5_3.1 | 0:6.3.6-1.1.el5_3.1 |
Same product
fetchmail: all recordsOther highest-scoring records for the same primary product.
- CVE-2001-1009Fetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or (2) POP/POP3 server to overwrite arbitrary memory a42Plan
- CVE-2001-0101Vulnerability in fetchmail 5.5.0-2 and earlier in the AUTHENTICATE GSSAPI command.41Plan
- CVE-2006-5974fetchmail 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 32Monitor
- CVE-2006-5867fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext passwords over unsecured links if certain circumstances 32Monitor
- CVE-2005-4348fetchmail before 6.3.1 and before 6.2.5.5, when configured for multidrop mode, allows remote attackers to cause a denial of service (applica32Monitor
- CVE-2001-0819A buffer overflow in Linux fetchmail before 5.8.6 allows remote attackers to execute arbitrary code via a large 'To:' field in an email head32Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:fetchmail | 6.3.9~rc2-1 · Debian:12 | Package registry (OSV) |
| red hat:fetchmail | 0:6.2.0-3.el3.5 · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
| red hat:fetchmail-debuginfo | 0:6.2.0-3.el3.5 · Red Hat:enterprise_linux:3::as | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- M
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.apple.com/archives/security-announce/2009/Feb/msg00000.html
- secunia.com/advisories/30742
- secunia.com/advisories/30895
- secunia.com/advisories/31262
- secunia.com/advisories/31287
- secunia.com/advisories/33937
- slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.495740
- support.apple.com/kb/HT3438
- wiki.rpath.com/wiki/Advisories:rPSA-2008-0235
- www.fetchmail.info/fetchmail-SA-2008-01.txt
- www.mandriva.com/security/advisories?name=MDVSA-2008:117
- www.openwall.com/lists/oss-security/2008/06/13/1
- www.openwall.com/lists/oss-security/2021/08/09/1
- www.securityfocus.com/archive/1/493391/100/0/threaded
- www.securityfocus.com/archive/1/494865/100/0/threaded
- www.securityfocus.com/bid/29705
- www.securitytracker.com/id?1020298
- www.vupen.com/english/advisories/2008/1860/references
- www.vupen.com/english/advisories/2009/0422
- bugzilla.novell.com/show_bug.cgi?id=354291
Vendor advisories and official records. Exploit/PoC links are deliberately left out.