VulnerabilityModified
CVE-2016-5117
OpenNTPD before 6.0p1 does not validate the CN for HTTPS constraint requests, which allows remote attackers to bypass the man-in-the-middle mitigations via a crafted timestamp constraint with a valid certificate.
MEDIUM 5.9EPSS 0.70%
Does this matter?
Lower severity and a low EPSS score (0.70%). Track it; it rarely justifies an emergency change on its own.
Description
OpenNTPD before 6.0p1 does not validate the CN for HTTPS constraint requests, which allows remote attackers to bypass the man-in-the-middle mitigations via a crafted timestamp constraint with a valid certificate.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.70% probability · 51th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-254
- Affected
- openntpd/openntpd
- Source
- cve@mitre.org
References
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28Patch
- http://www.openntpd.org/txt/release-6.0p1.txtVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/05/23/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/05/29/6Mailing List, Third Party Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28Patch
- http://www.openntpd.org/txt/release-6.0p1.txtVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/05/23/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/05/29/6Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.