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No exploitation reportedFix available

CVE-2020-16094

No exploitation reported by the sources we read.

  • Published2020-07-28
  • WeaknessCWE-674

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

In imap_scan_tree_recursive in Claws Mail through 3.17.6, a malicious IMAP server can trigger stack consumption because of unlimited recursion into subdirectories during a rebuild of the folder tree.

Timeline

dates in UTC
  1. 2020-07-2819:15CVE publishedNVD

Versions per branch

NVD
Claws-mail
BranchAffectedFixed in
3.17≤ 3.17.6no fix published
Fedoraproject fedora
BranchAffectedFixed in
31.x= 31no fix published
32.x= 32no fix published
33.x= 33no fix published

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

  • claws-mailUbuntu:20.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:18.04:LTSall versions · no fixed version listed
  • claws-mailUbuntu:16.04:LTSall versions · no fixed version listed
  • claws-mailMageia:7all versions · fixed in 3.17.7-1.mga7
  • claws-mailDebian:14all versions · fixed in 3.17.7-1
  • claws-mailDebian:13all versions · fixed in 3.17.7-1
  • claws-mailDebian:12all versions · fixed in 3.17.7-1
  • claws-mailCleanStartall versions · fixed in 3.17.7-r0

13 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-16094 Red Hat Product Security

    claws-mail: malicious IMAP server can trigger stack consumption

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-07-28
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8f6j-9hh3-9c9x

Frequently asked questions

What is CVE-2020-16094?

In imap_scan_tree_recursive in Claws Mail through 3.17.6, a malicious IMAP server can trigger stack consumption because of unlimited recursion into subdirectories during a rebuild of the folder tree.

Is CVE-2020-16094 actively exploited?

Active exploitation of CVE-2020-16094 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-16094?

CVE-2020-16094 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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