CVE-2019-19521
CVSS v3
9.8
CRITICAL
EPSS Score
2.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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).
Technical details
- Published
- 2019-12-05
Frequently asked questions
What is CVE-2019-19521?
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).
Is CVE-2019-19521 actively exploited?
Active exploitation of CVE-2019-19521 has not been confirmed. Its EPSS score was 2.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-19521?
CVE-2019-19521 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2019-19521 affecting your environment?
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