The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT…
Priority LOW 31CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.
Why it matters now
EPSS 0.05628 92nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mit:kerberos:5-1.6.3:*:*:*:*:*:*:* | 5-1.6.3 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.5:*:*:*:*:*:*:* | 1.5 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.5.1:*:*:*:*:*:*:* | 1.5.1 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.5.2:*:*:*:*:*:*:* | 1.5.2 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.5.3:*:*:*:*:*:*:* | 1.5.3 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.6:*:*:*:*:*:*:* | 1.6 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.6.1:*:*:*:*:*:*:* | 1.6.1 | Vulnerable | moos-ivp |
| cpe:2.3:a:mit:kerberos_5:1.6.2:*:*:*:*:*:*:* | 1.6.2 | Vulnerable | moos-ivp |
- cpe:2.3:a:mit:kerberos:5-1.6.3:*:*:*:*:*:*:* Versions 5-1.6.3 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.5:*:*:*:*:*:*:* Versions 1.5 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.5.1:*:*:*:*:*:*:* Versions 1.5.1 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.5.2:*:*:*:*:*:*:* Versions 1.5.2 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.5.3:*:*:*:*:*:*:* Versions 1.5.3 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.6:*:*:*:*:*:*:* Versions 1.6 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.6.1:*:*:*:*:*:*:* Versions 1.6.1 Vulnerable ·moos-ivp
- cpe:2.3:a:mit:kerberos_5:1.6.2:*:*:*:*:*:*:* Versions 1.6.2 Vulnerable ·moos-ivp
Remediation
Red Hat 1 advisory
- RHSA-2009:0408 Released 2009-04-07 · Red Hat rating Importantkrb5 security update
- Red Hat Enterprise Linux (v. 5 server) krb5-1.6.1-31.el5_3.3, krb5-devel-1.6.1-31.el5_3.3, krb5-devel-1.6.1-31.el5_3.3.i386 +14
- Red Hat Enterprise Linux Desktop (v. 5 client) krb5-1.6.1-31.el5_3.3, krb5-libs-1.6.1-31.el5_3.3, krb5-libs-1.6.1-31.el5_3.3.i386 +2
- Red Hat Enterprise Linux Desktop Workstation (v. 5 client) krb5-1.6.1-31.el5_3.3, krb5-devel-1.6.1-31.el5_3.3, krb5-devel-1.6.1-31.el5_3.3.i386 +2
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux (v. 5 server) | Fixed | RHSA-2009:0408 |
| Red Hat Enterprise Linux Desktop (v. 5 client) | Fixed | RHSA-2009:0408 |
| Red Hat Enterprise Linux Desktop Workstation (v. 5 client) | Fixed | RHSA-2009:0408 |
Timeline
- 2026-10-02 Threatist record created from CVE-2009-0845
- 2026-10-03 Alias added: GHSA-74gr-5fw9-9jj5
References
Exploit 1
Advisory 13
Other 15
- http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html
- http://support.apple.com/kb/HT3549
- http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm
- http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html
- ADV-2009-0976
- http://www-01.ibm.com/support/docview.wss?uid=swg21396120
- ADV-2009-1057
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt
- oval:org.mitre.oval:def:6449
- http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0058
- ADV-2009-1297
- http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402
- http://wiki.rpath.com/Advisories:rPSA-2009-0058
- oval:org.mitre.oval:def:10044
- ADV-2009-1106
More moos-ivp Kerberos vulnerabilities
- TI-2001-00539 Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows… CVSS 2.0HIGH 10.0
- TI-2000-00389 Buffer overflow in krb_rd_req function in Kerberos 4 and 5 allows remote attackers to gain root privileges. CVSS 2.0HIGH 10.0
- TI-2004-00472 Multiple buffer overflows in krb5_aname_to_localname for MIT Kerberos 5 (krb5) 1.3.3 and… CVSS 2.0HIGH 10.0
- TI-2009-03997 Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the… CVSS 2.0HIGH 10.0
- TI-2000-00391 Buffer overflow in krshd in Kerberos 5 allows remote attackers to gain root privileges. CVSS 2.0HIGH 10.0
- TI-2000-00390 Buffer overflow in krb425_conv_principal function in Kerberos 5 allows remote attackers to gain root privileges. CVSS 2.0HIGH 10.0
Sources
- CVE-2009-0845 · CVE Program
- CVE-2009-0845 · NVD
- FIRST EPSS
- GHSA-74gr-5fw9-9jj5 · GitHub Advisory Database · CC BY 4.0
- CVE-2009-0845 · Red Hat security data · CC BY 4.0
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