Critical severity9.8NVD Advisory· Published Dec 5, 2019· Updated Jun 17, 2026
CVE-2019-19521
CVE-2019-19521
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).
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- OpenBSD/libcdescription
Patches
Vulnerability mechanics
References
7- www.openwall.com/lists/oss-security/2019/12/04/5nvdExploitMailing ListThird Party Advisory
- seclists.org/bugtraq/2019/Dec/8nvdExploitMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2019/12/04/5nvdExploitMailing ListThird Party Advisory
- packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.htmlnvdThird Party Advisory
- seclists.org/fulldisclosure/2019/Dec/14nvdThird Party Advisory
- www.openbsd.org/errata66.htmlnvdVendor Advisory
- www.openwall.com/lists/oss-security/2019/12/04/6nvdMailing List
News mentions
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