Is CVE-2009-4212 actively exploited?

CVE-2009-4212 has no public evidence of in-the-wild exploitation as of 2026-04-23.

What is the CVSS score for CVE-2009-4212?

CVE-2009-4212 has a CVSS score of 10 (UNKNOWN severity). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

How do I patch CVE-2009-4212?

Patch guidance is available from mit security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2009-4212.

CVE-2009-4212 - remediation guidance & executive summary

Q: Which products are affected by CVE-2009-4212?

21 products: mit kerberos, mit kerberos 5, mit kerberos 5, mit kerberos 5, mit kerberos 5, and 16 more.

Description

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.

CVSS Metrics

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Access Vector: network
Access Cmplx: low
Auth: none
Confidentiality: complete
Integrity: complete
Availability: complete
Weaknesses: CWE-189

Metadata

Primary Vendor: MIT
Published: 1/13/2010
Last Modified: 4/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

mit : kerberosmit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5mit : kerberos_5

Remediation Guidance

Executive Summary

View on NIST NVD