HIGH

CVE-2021-31239

Q: What is 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.

Q: Is CVE-2021-31239 actively exploited?

Active exploitation of CVE-2021-31239 has not been confirmed. Its EPSS score was 2.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-31239?

CVE-2021-31239 has a CVSS v3 base score of 7.5 (HIGH severity).

CVSS v3

7.5

HIGH

EPSS Score

2.4 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

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

sqliteBitnamifrom 3.35.4 · fixed in 3.35.5

Vendor advisories

CVE-2021-31239 Red Hat Product Security
sqlite: denial of service via the appendvfs.c function
ICSA-23-348-10 CISA5 known affected
Siemens SIMATIC S7-1500
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
SSA-398330 Siemens ProductCERT5 known affected
SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5
ICSA-23-222-05 CISA1 known affected
Siemens RUGGEDCOM CROSSBOW
RUGGEDCOM CROSSBOW
SSA-472630 Siemens ProductCERT1 known affected
SSA-472630: Security Vulnerabilities Fixed in RUGGEDCOM CROSSBOW V5.4
RUGGEDCOM CROSSBOW

Full record on NVD

Description

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.

Technical details

Published: 2023-05-09

Frequently asked questions

What is 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.

Is CVE-2021-31239 actively exploited?

Active exploitation of CVE-2021-31239 has not been confirmed. Its EPSS score was 2.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31239?

CVE-2021-31239 has a CVSS v3 base score of 7.5 (HIGH severity).

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