CVE-2019-19521
9.8
CRITICAL · CVSS 3.1 · EPSS 2.7% (pctl 86)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).
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 | 2.74% — more likely to be exploited than 86% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2019-12-05 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| openbsd | openbsd |
References
- http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2019/Dec/14
- http://www.openwall.com/lists/oss-security/2019/12/04/5
- http://www.openwall.com/lists/oss-security/2019/12/04/6
- https://seclists.org/bugtraq/2019/Dec/8
- https://www.openbsd.org/errata66.html
- https://www.openwall.com/lists/oss-security/2019/12/04/5
- http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html
- http://seclists.org/fulldisclosure/2019/Dec/14
- http://www.openwall.com/lists/oss-security/2019/12/04/5
- http://www.openwall.com/lists/oss-security/2019/12/04/6
- https://seclists.org/bugtraq/2019/Dec/8
- https://www.openbsd.org/errata66.html
- https://www.openwall.com/lists/oss-security/2019/12/04/5
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