In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a…
Priority LOW 27CWE-142Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00409 35th percentileScored 2026-11-07
Fix Partial fetchmail (fetchmail): 6.5.6Red Hat: 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA fetchmail (fetchmail) Fixed in 6.5.6
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-61962
- 2026-10-03 Alias added: GHSA-q9v7-qrhr-3q9v
References
More fetchmail vulnerabilities
- TI-2001-00964 Fetchmail (aka fetchmail-ssl) before 5.8.17 allows a remote malicious (1) IMAP server or… CVSS 2.0HIGH 10.0
- TI-2001-00101 Vulnerability in fetchmail 5.5.0-2 and earlier in the AUTHENTICATE GSSAPI command. CVSS 2.0HIGH 10.0
- TI-2001-00782 A buffer overflow in Linux fetchmail before 5.8.6 allows remote attackers to execute… CVSS 2.0HIGH 7.5
- TI-2006-05756 fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda… CVSS 2.0HIGH 7.8
- TI-2006-05650 fetchmail before 6.3.6-rc4 does not properly enforce TLS and may transmit cleartext… CVSS 2.0HIGH 7.8
- TI-2002-01289 Heap-based buffer overflow in Fetchmail 6.1.3 and earlier does not account for the "@"… CVSS 2.0HIGH 7.5
Sources
- CVE-2025-61962 · CVE Program
- CVE-2025-61962 · NVD
- FIRST EPSS
- GHSA-q9v7-qrhr-3q9v · GitHub Advisory Database · CC BY 4.0
- CVE-2025-61962 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences