CVE-2021-40540
9.8
CRITICAL · CVSS 3.1 · EPSS 2.6% (pctl 85)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.63% — more likely to be exploited than 85% of all CVEs |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-09-07 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| ulfius project | ulfius |
References
- http://packetstormsecurity.com/files/164152/Ulfius-Web-Framework-Remote-Memory-Corruption.html
- 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
- https://github.com/babelouest/ulfius/commit/c83f564c184a27145e07c274b305cabe943bbfaa
- https://github.com/babelouest/ulfius/compare/v2.7.3...v2.7.4
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