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Fencer Vulns
medium 6.1

CVE-2021-37746 json

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 bef…

published 2021-07-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24227

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

Patch / fix

  • claws-mail claws-mail 3.18.0
  • sylpheed Debian 12 3.8.0~beta1-1+deb12u1
  • sylpheed Debian 13 3.8.0~beta1-2+deb13u1
  • claws-mail Debian 14, Debian 13, Debian 12 3.18.0-1

debian advisories DEBIAN-CVE-2021-37746

  • claws-mail Arch Linux 3.18.0-1

arch linux advisories AVG-2243

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37746 updated

claws-mail: insufficient link checks before accepting a click in textview_uri_security_check() in textview.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.