LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a…
Priority LOW 37CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
Why it matters now
EPSS 0.02404 84th 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 · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libetpan_project:libetpan:*:*:*:*:*:*:*:* | up to 1.9.4 | Vulnerable | Libetpan Project |
| cpe:2.3:a:libmailcore:mailcore2:*:*:*:*:*:*:*:* | up to 0.6.3 | Vulnerable | Libmailcore |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:libetpan_project:libetpan:*:*:*:*:*:*:*:* Versions up to 1.9.4 Vulnerable ·Libetpan Project
- cpe:2.3:a:libmailcore:mailcore2:*:*:*:*:*:*:*:* Versions up to 0.6.3 Vulnerable ·Libmailcore
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-15953
- 2026-10-03 Alias added: GHSA-f329-rp43-94r4
References
Sources
- CVE-2020-15953 · CVE Program
- CVE-2020-15953 · NVD
- FIRST EPSS
- GHSA-f329-rp43-94r4 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-15953 · 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