CVE-2021-40540
CRITICAL
9.8
CVSS Score
Published: September 7, 2021 at 01:50 AM UTC
Updated: June 17, 2026 at 04:07 AM UTC
1 product affected across 1 vendorUlfius
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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.7.4
Affected range stops below 2.7.4, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/164152/Ulfius-Web-Framework-Remote-Memory-Corruption.htmlx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/babelouest/ulfius/commit/c83f564c184a27145e07c274b305cabe943bbfaax_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/babelouest/ulfius/compare/v2.7.3...v2.7.4CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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