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No exploitation reportedFix available

CVE-2021-37746

No exploitation reported by the sources we read.

  • Published2021-07-30
  • WeaknessCWE-601

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

textview_uri_security_check in textview.c in Claws Mail before 3.18.0, and Sylpheed through 3.7.0, does not have sufficient link checks before accepting a click.

Timeline

dates in UTC
  1. 2021-07-3015:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
33.x= 33no fix published
34.x= 34no fix published
Claws-mail
BranchAffectedFixed in
3.18< 3.18.03.18.0
Sylpheed project sylpheed
BranchAffectedFixed in
3.7≤ 3.7.0no 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:26.10all versions · no fixed version listed
  • claws-mailUbuntu:26.04:LTSall versions · no fixed version listed
  • claws-mailMageia:8all versions · fixed in 3.18.0-1.mga8
  • claws-mailDebian:14all versions · fixed in 3.18.0-1
  • claws-mailDebian:13all versions · fixed in 3.18.0-1
  • claws-mailDebian:12all versions · fixed in 3.18.0-1
  • sylpheedUbuntu:25.10all versions · no fixed version listedand 1 other package
  • sylpheedUbuntu:24.04:LTSall versions · no fixed version listedand 1 other package

7 more package ranges on OSV.dev

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:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2021-07-30
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7cx5-4rpx-pcm3

Frequently asked questions

What is CVE-2021-37746?

textview_uri_security_check in textview.c in Claws Mail before 3.18.0, and Sylpheed through 3.7.0, does not have sufficient link checks before accepting a click.

Is CVE-2021-37746 actively exploited?

Active exploitation of CVE-2021-37746 has not been confirmed. Its EPSS score was 1.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-37746?

CVE-2021-37746 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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Sources for this record