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 malformed HTTP requests.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.63% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- ulfius project/ulfius
- Source
- cve@mitre.org
EPSS 2.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/164152/Ulfius-Web-Framework-Remote-Memory-Corruption.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/babelouest/ulfius/commit/c83f564c184a27145e07c274b305cabe943bbfaaPatch, Third Party Advisory
- https://github.com/babelouest/ulfius/compare/v2.7.3...v2.7.4Patch, Third Party Advisory
- http://packetstormsecurity.com/files/164152/Ulfius-Web-Framework-Remote-Memory-Corruption.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/babelouest/ulfius/commit/c83f564c184a27145e07c274b305cabe943bbfaaPatch, Third Party Advisory
- https://github.com/babelouest/ulfius/compare/v2.7.3...v2.7.4Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.