The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls…
Priority LOW 37Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
Why it matters now
EPSS 0.04593 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:frederik_vermeulen:netqmail:1.06:*:*:*:*:*:*:* | 1.06 | Vulnerable | Frederik Vermeulen |
- cpe:2.3:a:frederik_vermeulen:netqmail:1.06:*:*:*:*:*:*:* Versions 1.06 Vulnerable ·Frederik Vermeulen
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2011-1431
- 2026-10-03 Alias added: GHSA-c4mq-4wp5-9pxq
References
Sources
- CVE-2011-1431 · CVE Program
- CVE-2011-1431 · NVD
- FIRST EPSS
- GHSA-c4mq-4wp5-9pxq · GitHub Advisory Database · CC BY 4.0
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