CVE-2017-7562
An authentication bypass flaw was found in the way krb5's certauth interface before 1.16.1 handled the validation of client certificates.
Does this matter?
Lower severity and a low EPSS score (3.18%). Track it; it rarely justifies an emergency change on its own.
Description
An authentication bypass flaw was found in the way krb5's certauth interface before 1.16.1 handled the validation of client certificates. A remote attacker able to communicate with the KDC could potentially use this flaw to impersonate arbitrary principals under rare and erroneous circumstances.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 3.18% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287, CWE-295
- Affected
- redhat/enterprise linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux workstation · mit/kerberos 5
- Source
- secalert@redhat.com
EPSS 3.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/100511Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0666Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562Issue Tracking, Patch, Third Party Advisory
- https://github.com/krb5/krb5/pull/694Patch, Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627dThird Party Advisory
- http://www.securityfocus.com/bid/100511Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0666Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562Issue Tracking, Patch, Third Party Advisory
- https://github.com/krb5/krb5/pull/694Patch, Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2Third Party Advisory
- https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627dThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.