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Vulnerabilities

Vulnerability · CVE-2021-31239

An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

Published May 9, 2023 · catalog updated Oct 14, 2026 · An issue found in

Check if you run it

No confirmed exploitation is on record for CVE-2021-31239. EPSS is 2.45%. Act only if a listed version of An issue found in is installed.

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.45%
Remediation
Advisory link
Affected products
cpe sqlite/sqlite

An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe sqlite/sqlite3.35.4

How to fix CVE-2021-31239

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-31239. EPSS is 2.45%. Act only if a listed version of An issue found in is installed.

Which versions are affected?

Compare what you have installed with 3.35.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 2.45%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 9, 2023 · NIST NVD

    Detected

    An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

  2. Oct 14, 2026 · NIST NVD

    Updated

    An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

Sources

  • CVE.orgVulnerability recordCVE-2021-31239

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-31239

    30-day exploitation probability 2.4%

    first.org
  • NIST NVDVulnerability recordCVE-2021-31239

    An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.