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No exploitation reportedFix available

CVE-2021-35331

No exploitation reported by the sources we read.

  • Published2021-07-05
  • WeaknessCWE-134

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 Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding

Timeline

dates in UTC
  1. 2021-07-0515:15CVE publishedNVD

Versions per branch

NVD
Tcl
BranchAffectedFixed in
8.6= 8.6.11no 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

  • tclSUSE:Linux Enterprise Module for Basesystem 15 SP3all versions · fixed in 8.6.12-150300.14.3.1
  • tclopenEuler:22.03-LTSall versions · fixed in 8.6.10-4.oe2203
  • tclopenEuler:20.03-LTS-SP3all versions · fixed in 8.6.10-4.oe1
  • tclopenEuler:20.03-LTS-SP1all versions · fixed in 8.6.10-4.oe1
  • tcl8.6Root:Debian:12all versions · fixed in 8.6.13+dfsg-2.root.io.2and 1 other package
  • tcl8.6Root:Debian:12all versions · fixed in 8.6.13+dfsg-2.aikido.3and 1 other package
  • tcl8.6Root:Debian:12all versions · fixed in 8.6.13+dfsg-2.root.io.1and 1 other package
  • tcl8.6Echoall versions · fixed in 8.6.16+dfsg-1+e1

8 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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-07-05
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-539q-24vg-qfm4

Frequently asked questions

What is CVE-2021-35331?

In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding

Is CVE-2021-35331 actively exploited?

Active exploitation of CVE-2021-35331 has not been confirmed. Its EPSS score was 1.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-35331?

CVE-2021-35331 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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