CVE-2009-4212

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

7.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-12-04 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2010-01-13 19:30 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:13 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 7.6% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2010-01-13 19:30 UTC

Last modified

2026-06-16 23:13 UTC

Exploit probability

7.6% · EPSS, next 30 days

Weakness

CWE-189

Record status

Modified

Affected

• Mit Kerberos 5-1.6.3
• Mit Kerberos 5 1.3
• Mit Kerberos 5 1.3.1
• Mit Kerberos 5 1.3.2
• Mit Kerberos 5 1.3.3
• Mit Kerberos 5 1.3.4
• Mit Kerberos 5 1.3.5
• Mit Kerberos 5 1.3.6

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-4212.md and follow it. Check whether this project is affected by CVE-2009-4212. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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