Is CVE-2017-11103 in the CISA KEV catalog?

No. CVE-2017-11103 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11103?

CVE-2017-11103 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2017-11103?

CVE-2017-11103 has an EPSS score of 5.12% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11103?

Upgrade heimdal on debian 11 to 7.4.0.dfsg.1-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2017-11103

HIGHEPSS 91th pctl

8.1

CVSS v3

NVD

Description

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.

CWE-345

How to fix

Remediation Available

heimdalDebian

Fixed in:7.4.0.dfsg.1-1CVE-2017-11103

heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2USN-3353-1

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1USN-3353-1

libkrb5-26-heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2USN-3353-1

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1USN-3353-1

sambaUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.10USN-3353-2

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.9USN-3353-2

samba-libsUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.10USN-3353-2

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.9USN-3353-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

5.12%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Third-Party Advisory10

Release Notes1

github.com

Other references1

h5l.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.