HOMEVULNERABILITIESCVE-2017-11103
HIGH

CVE-2017-11103

CWE-345Published: July 13, 2017· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2017-11103 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
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

Affected Vendors & Products

Apple2 product(s)
iphone osmac os x
Debian1 product(s)
debian linux
freebsd1 product(s)
freebsd
heimdal_project1 product(s)
heimdal
samba1 product(s)
samba
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.debian.org/security/2017/dsa-3912
ADVISORYhttp://www.securityfocus.com/bid/99551
ADVISORYhttp://www.securitytracker.com/id/1038876
ADVISORYhttp://www.securitytracker.com/id/1039427
ADVISORYhttps://support.apple.com/HT208112
ADVISORYhttps://support.apple.com/HT208144
ADVISORYhttps://support.apple.com/HT208221
ADVISORYhttps://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
ADVISORYhttps://www.orpheus-lyre.info/
ADVISORYhttps://www.samba.org/samba/security/CVE-2017-11103.html
ADVISORYhttp://www.debian.org/security/2017/dsa-3912
ADVISORYhttp://www.securityfocus.com/bid/99551
ADVISORYhttp://www.securitytracker.com/id/1038876
ADVISORYhttp://www.securitytracker.com/id/1039427
ADVISORYhttps://support.apple.com/HT208112
ADVISORYhttps://support.apple.com/HT208144
ADVISORYhttps://support.apple.com/HT208221
ADVISORYhttps://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
ADVISORYhttps://www.orpheus-lyre.info/
ADVISORYhttps://www.samba.org/samba/security/CVE-2017-11103.html

All References (24)

→
http://www.debian.org/security/2017/dsa-3912Third Party Advisory
→
http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
→
http://www.securityfocus.com/bid/99551Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1038876Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1039427Third Party Advisory · VDB Entry
→
https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Release Notes
→
https://support.apple.com/HT208112Third Party Advisory
→
https://support.apple.com/HT208144Third Party Advisory
→
https://support.apple.com/HT208221Third Party Advisory
→
https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.ascThird Party Advisory
→
https://www.orpheus-lyre.info/Third Party Advisory
→
https://www.samba.org/samba/security/CVE-2017-11103.htmlThird Party Advisory
→
http://www.debian.org/security/2017/dsa-3912Third Party Advisory
→
http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
→
http://www.securityfocus.com/bid/99551Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2017-11103
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-345
CISA KEVNo
Affected5 vendor(s)
PublishedJul 13, 2017

Related CVEs (CWE-345)

CVE-2026-45674
10.0
CVE-2026-47691
10.0
CVE-2022-3703
10.0
CVE-2014-8165
10.0
CVE-2026-35051
10.0
CVE-2022-36130
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-11103 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2017-11103·NVD