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No exploitation reportedFix available

CVE-2020-15953

No exploitation reported by the sources we read.

  • Published2020-07-27
  • WeaknessCWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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."

Timeline

dates in UTC
  1. 2020-07-2707:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
31.x= 31no fix published
32.x= 32no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
Libetpan project libetpan
BranchAffectedFixed in
1.9≤ 1.9.4no fix published

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libetpanUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • libetpanUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • libetpanUbuntu:26.10all versions · no fixed version listed
  • libetpanUbuntu:26.04:LTSall versions · no fixed version listed
  • libetpanUbuntu:25.10all versions · no fixed version listed
  • libetpanUbuntu:24.04:LTSall versions · no fixed version listed
  • libetpanUbuntu:22.04:LTSall versions · no fixed version listed
  • libetpanUbuntu:16.04:LTSall versions · fixed in 1.6-1ubuntu0.1

20 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-15953 Red Hat Product Security

    libetpan: response injection via STARTTLS in IMAP

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2020-07-27
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-f329-rp43-94r4

Frequently asked questions

What is CVE-2020-15953?

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."

Is CVE-2020-15953 actively exploited?

Active exploitation of CVE-2020-15953 has not been confirmed. Its EPSS score was 2.4% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-15953?

CVE-2020-15953 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

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