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CVE-2017-7562

22
FAUCET Score

CVE-2017-7562 describes an authentication bypass vulnerability in krb5's certauth interface prior to version 1.16.1, affecting various MIT and Red Hat Enterprise Linux distributions and Kerberos 5. A remote attacker could exploit this flaw to impersonate arbitrary principals under specific, rare, and erroneous conditions. The vulnerability has a CVSS score of 6.5 (Medium), indicating a low attack complexity and the potential for high integrity impact, but no confidentiality or availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
>= 1.0, < 1.16.1CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.30%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0330 is in the 96th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: krb5-0:1.15.1-18.el7
View patch

Vendor Advisories (1)

redhatCVE-2017-7562Moderate

krb5: Authentication bypass by improper validation of certificate EKU and SAN

Aug 25, 2017

References

access.redhat.com / errata/RHSA-2018:0666
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / krb5/krb5/pull/694
PatchThird Party Advisory
github.com / krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196
Third Party Advisory
github.com / krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2
Third Party Advisory
github.com / krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d
Third Party Advisory
securityfocus.com / bid/100511
Third Party AdvisoryVDB Entry