The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) befor
The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer.
- BDU:2015-04525
- BDU:2015-04526
- BDU:2015-04527
- BDU:2015-04528
- BDU:2015-04529
- BDU:2015-07290
- BDU:2015-07291
- BDU:2015-07303
- BDU:2015-07308
- BDU:2015-07315
- BDU:2015-07323
- BDU:2015-08502
- BDU:2015-08503
- BDU:2015-08504
- BDU:2015-08505
- BDU:2015-08506
- BDU:2015-08507
- BDU:2015-09389
- DSA-1766-1
- openSUSE-SU-2024:10004-1
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Apr 8, 2009
- Updated
- Jun 16, 2026
- EPSS
- 8.9% · 95th percentile
- CWE
- CWE-824
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Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 8.9%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mit | kerberos 5 | cpe:2.3:a:mit:kerberos_5 |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple mac os xbefore 10.5.7
- canonical ubuntu linux6.06
- canonical ubuntu linux7.10
- canonical ubuntu linux8.04
- canonical ubuntu linux8.10
- fedoraproject fedora10
- fedoraproject fedora9
- mit kerberos 5before 1.6.4
- redhat enterprise linux4.0
- redhat enterprise linux desktop3.0
- redhat enterprise linux desktop4.0
- redhat enterprise linux eus4.7
- redhat enterprise linux server2.0
- redhat enterprise linux server3.0
- redhat enterprise linux server4.0
- redhat enterprise linux workstation2.0
- redhat enterprise linux workstation3.0
- redhat enterprise linux workstation4.0
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 1.6.dfsg.4~beta1-13 | 1.6.dfsg.4~beta1-13 |
| Debian:4.0 | krb5 | before 1.4.4-7etch7 | 1.4.4-7etch7 |
| Debian:5.0 | krb5 | before 1.6.dfsg.4~beta1-5lenny1 | 1.6.dfsg.4~beta1-5lenny1 |
| openSUSE:Tumbleweed | krb5 | before 1.15-1.1 | 1.15-1.1 |
| Red Hat:enterprise_linux:2.1::as | krb5 | before 0:1.2.2-49 | 0:1.2.2-49 |
| Red Hat:enterprise_linux:2.1::as | krb5-devel | before 0:1.2.2-49 | 0:1.2.2-49 |
| Red Hat:enterprise_linux:2.1::as | krb5-libs | before 0:1.2.2-49 | 0:1.2.2-49 |
| Red Hat:enterprise_linux:2.1::as | krb5-server | before 0:1.2.2-49 | 0:1.2.2-49 |
| Red Hat:enterprise_linux:2.1::as | krb5-workstation | before 0:1.2.2-49 | 0:1.2.2-49 |
| Red Hat:enterprise_linux:3::as | krb5 | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:3::as | krb5-debuginfo | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:3::as | krb5-devel | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:3::as | krb5-libs | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:3::as | krb5-server | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:3::as | krb5-workstation | before 0:1.2.7-70 | 0:1.2.7-70 |
| Red Hat:enterprise_linux:4::as | krb5 | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:4::as | krb5-debuginfo | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:4::as | krb5-devel | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:4::as | krb5-libs | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:4::as | krb5-server | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:4::as | krb5-workstation | before 0:1.3.4-60.el4_7.2 | 0:1.3.4-60.el4_7.2 |
| Red Hat:enterprise_linux:5::client | krb5-libs | before 0:1.6.1-31.el5_3.3 | 0:1.6.1-31.el5_3.3 |
| Red Hat:enterprise_linux:5::client | krb5-workstation | before 0:1.6.1-31.el5_3.3 | 0:1.6.1-31.el5_3.3 |
| Red Hat:enterprise_linux:5::client_workstation | krb5 | before 0:1.6.1-31.el5_3.3 | 0:1.6.1-31.el5_3.3 |
+3
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-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
- CVE-2007-3999Stack-based buffer overflow in the svcauth_gss_validate function in lib/rpc/svc_auth_gss.c in the RPCSEC_GSS RPC library (librpcsecgss) in M43Plan
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 | 1.6.dfsg.4~beta1-13 · Debian:12 | Package registry (OSV) |
| opensuse:krb5 | 1.15-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:krb5 | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:krb5-debuginfo | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:krb5-devel | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:krb5-libs | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:krb5-server | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:krb5-workstation | 0:1.6.1-31.el5_3.3 · Red Hat:enterprise_linux:5::client | 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
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
CWE-824 · Access of Uninitialized PointerCVSS vector
AV:N/AC:L/Au:N/C:C/I:C/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.apple.com/archives/security-announce/2009/May/msg00002.html
- lists.vmware.com/pipermail/security-announce/2009/000059.html
- marc.info/?l=bugtraq&m=124896429301168&w=2
- marc.info/?l=bugtraq&m=130497213107107&w=2
- rhn.redhat.com/errata/RHSA-2009-0409.html
- rhn.redhat.com/errata/RHSA-2009-0410.html
- secunia.com/advisories/34594
- secunia.com/advisories/34598
- secunia.com/advisories/34617
- secunia.com/advisories/34622
- secunia.com/advisories/34628
- secunia.com/advisories/34630
- secunia.com/advisories/34637
- secunia.com/advisories/34640
- secunia.com/advisories/34734
- secunia.com/advisories/35074
- secunia.com/advisories/35667
- security.gentoo.org/glsa/glsa-200904-09.xml
- sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1
- support.apple.com/kb/HT3549
Vendor advisories and official records. Exploit/PoC links are deliberately left out.