The krb5_ldap_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9
The krb5_ldap_lockout_audit function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9.1, when the LDAP back end is used, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via unspecified vectors, related to the locked_check_p function. NOTE: the Berkeley DB vector is covered by CVE-2011-4151.
- Published
- Oct 20, 2011
- Updated
- Jun 16, 2026
- EPSS
- 4.2% · 91th percentile
- CWE
- CWE-20
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 4.2%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mit | kerberos 5 | cpe:2.3:a:mit:kerberos_5 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- mit kerberos 51.8
- mit kerberos 51.8.1
- mit kerberos 51.8.2
- mit kerberos 51.8.3
- mit kerberos 51.8.4
- mit kerberos 51.9
- mit kerberos 51.9.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | krb5 | before 1.10+dfsg~alpha1-1 | 1.10+dfsg~alpha1-1 |
| Debian:6.0 | krb5 | before 1.8.3+dfsg-4squeeze5 | 1.8.3+dfsg-4squeeze5 |
| Red Hat:enterprise_linux:6::server | krb5 | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-debuginfo | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-devel | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-libs | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-pkinit-openssl | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-server | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-server-ldap | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
| Red Hat:enterprise_linux:6::server | krb5-workstation | before 0:1.9-9.el6_1.2 | 0:1.9-9.el6_1.2 |
Same product
mit: all recordsOther highest-scoring records for the same primary product.
- CVE-2007-0956The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username 49Plan
- CVE-2011-0285The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT Kerberos 5 (aka krb5) 1.7 through 1.9 46Plan
- CVE-2001-0247Buffer overflows in BSD-based FTP servers allows remote attackers to execute arbitrary commands via a long pattern string containing a {} se46Plan
- CVE-2002-1235The kadm_ser_in function in (1) the Kerberos v4compatibility administration daemon (kadmind4) in the MIT Kerberos 5 (krb5) krb5-1.2.6 and ea45Plan
- CVE-2009-0846The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) befor43Plan
- CVE-2008-0947Buffer overflow in the RPC library used by libgssrpc and kadmind in MIT Kerberos 5 (krb5) 1.4 through 1.6.3 allows remote attackers to execu43Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:krb5 | 1.10+dfsg~alpha1-1 · Debian:12 | Package registry (OSV) |
| red hat:krb5 | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-debuginfo | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-devel | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-libs | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-pkinit-openssl | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-server | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-server-ldap | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
| red hat:krb5-workstation | 0:1.9-9.el6_1.2 · Red Hat:enterprise_linux:6::server | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- C
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- lists.opensuse.org/opensuse-security-announce/2011-10/msg00009.html
- web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt
- www.kb.cert.org/vuls/id/659251
- www.mandriva.com/security/advisories?name=MDVSA-2011:159
- www.mandriva.com/security/advisories?name=MDVSA-2011:160
- www.redhat.com/support/errata/RHSA-2011-1379.html
- bugs.launchpad.net/ubuntu/+source/krb5/+bug/715579
Vendor advisories and official records. Exploit/PoC links are deliberately left out.