HOME VULNERABILITIESCVE-2007-0956

CRITICAL

CVE-2007-0956

CWE-306Published: April 6, 2007· Updated: Jun 16, 2026

10.0

CVSS v3.1

Official Description

The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username beginning with a '-' character, a similar issue to CVE-2007-0882.

Technical Analysis

CVE-2007-0956 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityC

IntegrityC

AvailabilityC

AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

mit1 product(s)

kerberos 5

Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://secunia.com/advisories/24706

ADVISORYhttp://secunia.com/advisories/24735

ADVISORYhttp://secunia.com/advisories/24736

ADVISORYhttp://secunia.com/advisories/24740

ADVISORYhttp://secunia.com/advisories/24750

ADVISORYhttp://secunia.com/advisories/24755

ADVISORYhttp://secunia.com/advisories/24757

ADVISORYhttp://secunia.com/advisories/24785

ADVISORYhttp://secunia.com/advisories/24786

ADVISORYhttp://secunia.com/advisories/24817

ADVISORYhttp://security.gentoo.org/glsa/glsa-200704-02.xml

ADVISORYhttp://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-001-telnetd.txt

ADVISORYhttp://www.debian.org/security/2007/dsa-1276

ADVISORYhttp://www.kb.cert.org/vuls/id/220816

ADVISORYhttp://www.mandriva.com/security/advisories?name=MDKSA-2007:077

ADVISORYhttp://www.redhat.com/support/errata/RHSA-2007-0095.html

ADVISORYhttp://www.securityfocus.com/archive/1/464590/100/0/threaded

ADVISORYhttp://www.securityfocus.com/archive/1/464666/100/0/threaded

ADVISORYhttp://www.securityfocus.com/archive/1/464814/30/7170/threaded

ADVISORYhttp://www.securityfocus.com/bid/23281

ADVISORYhttp://www.securitytracker.com/id?1017848

ADVISORYhttp://www.ubuntu.com/usn/usn-449-1

ADVISORYhttp://www.us-cert.gov/cas/techalerts/TA07-093B.html

ADVISORYhttp://www.vupen.com/english/advisories/2007/1218

ADVISORYhttp://www.vupen.com/english/advisories/2007/1249

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/33414

ADVISORYhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10046

ADVISORYhttp://secunia.com/advisories/24706

ADVISORYhttp://secunia.com/advisories/24735

ADVISORYhttp://secunia.com/advisories/24736

ADVISORYhttp://secunia.com/advisories/24740

ADVISORYhttp://secunia.com/advisories/24750

ADVISORYhttp://secunia.com/advisories/24755

ADVISORYhttp://secunia.com/advisories/24757

ADVISORYhttp://secunia.com/advisories/24785

ADVISORYhttp://secunia.com/advisories/24786

ADVISORYhttp://secunia.com/advisories/24817

ADVISORYhttp://security.gentoo.org/glsa/glsa-200704-02.xml

ADVISORYhttp://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-001-telnetd.txt

ADVISORYhttp://www.debian.org/security/2007/dsa-1276

ADVISORYhttp://www.kb.cert.org/vuls/id/220816

ADVISORYhttp://www.mandriva.com/security/advisories?name=MDKSA-2007:077

ADVISORYhttp://www.redhat.com/support/errata/RHSA-2007-0095.html

ADVISORYhttp://www.securityfocus.com/archive/1/464590/100/0/threaded

ADVISORYhttp://www.securityfocus.com/archive/1/464666/100/0/threaded

ADVISORYhttp://www.securityfocus.com/archive/1/464814/30/7170/threaded

ADVISORYhttp://www.securityfocus.com/bid/23281

ADVISORYhttp://www.securitytracker.com/id?1017848

ADVISORYhttp://www.ubuntu.com/usn/usn-449-1

ADVISORYhttp://www.us-cert.gov/cas/techalerts/TA07-093B.html

ADVISORYhttp://www.vupen.com/english/advisories/2007/1218

ADVISORYhttp://www.vupen.com/english/advisories/2007/1249

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/33414

ADVISORYhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10046

All References (60)

→

ftp://patches.sgi.com/support/free/security/advisories/20070401-01-P.ascBroken Link

→

http://lists.suse.com/archive/suse-security-announce/2007-Apr/0001.htmlBroken Link

→

http://secunia.com/advisories/24706Third Party Advisory

→

http://secunia.com/advisories/24735Third Party Advisory

→

http://secunia.com/advisories/24736Third Party Advisory

→

http://secunia.com/advisories/24740Third Party Advisory

→

http://secunia.com/advisories/24750Third Party Advisory

→

http://secunia.com/advisories/24755Third Party Advisory

→

http://secunia.com/advisories/24757Third Party Advisory

→

http://secunia.com/advisories/24785Third Party Advisory

→

http://secunia.com/advisories/24786Third Party Advisory

→

http://secunia.com/advisories/24817Third Party Advisory

→

http://security.gentoo.org/glsa/glsa-200704-02.xmlThird Party Advisory

→

http://sunsolve.sun.com/search/document.do?assetkey=1-26-102867-1Broken Link

→

http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-001-telnetd.txtVendor Advisory

Quick Facts

CVE IDCVE-2007-0956

CVSS Score10.0 / 10

SeverityCRITICAL

WeaknessCWE-306

CISA KEVNo

Affected3 vendor(s)

PublishedApr 6, 2007

Related CVEs (CWE-306)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2007-0956 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.

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