CVE-2021-35331

HIGHNVD 7.87.8—

7.8

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

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 57.2%
KEV: Not listed

Published

July 5, 2021

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://core.tcl-lang.org/tcl/info/28ef6c0c741408a2
cve@mitrehttps://core.tcl-lang.org/tcl/info/bad6cc213dfe8280
cve@mitrehttps://github.com/tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222
cve@mitrehttps://sqlite.org/forum/info/7dcd751996c93ec9
af854a3a-2127-422b-91ae-364da2661108https://core.tcl-lang.org/tcl/info/28ef6c0c741408a2
af854a3a-2127-422b-91ae-364da2661108https://core.tcl-lang.org/tcl/info/bad6cc213dfe8280
af854a3a-2127-422b-91ae-364da2661108https://github.com/tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222
af854a3a-2127-422b-91ae-364da2661108https://sqlite.org/forum/info/7dcd751996c93ec9

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-134Use of Externally-Controlled Format String

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 14:09 UTCEG score recompute
2026-05-26 14:09 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-35331?

CVE-2021-35331 is a high vulnerability published on July 5, 2021. 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

When was CVE-2021-35331 disclosed?

CVE-2021-35331 was first published in the National Vulnerability Database on July 5, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-35331 actively exploited?

CVE-2021-35331 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

CVE-2021-35331 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2021-35331?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35331, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-35331

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-35331?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)