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CVE-2021-35331

24
FAUCET Score

CVE-2021-35331 describes a format string vulnerability in Tcl version 8.6.11, specifically within the nmakehlp.c component, which could potentially lead to code execution through a specially crafted file. This vulnerability carries a high CVSS score of 7.8, indicating a significant risk with local access and user interaction required for exploitation, potentially resulting in high impact to confidentiality, integrity, and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
8.6.11CPE matchmatch criteria
cpe:2.3:a:tcl:tcl:8.6.11:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.64%
Probability of exploitation in next 30 days
EPSS Percentile
73.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0164 is in the 73rd percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

core.tcl-lang.org / tcl/info/28ef6c0c741408a2
ExploitPatchVendor Advisory
core.tcl-lang.org / tcl/info/bad6cc213dfe8280
ExploitVendor Advisory
github.com / tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222
PatchThird Party Advisory
sqlite.org / forum/info/7dcd751996c93ec9
ExploitThird Party Advisory