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Fencer Vulns
critical 10.0

CVE-2009-4212 json

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 thro…

published 2010-01-13 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-4182

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.6%
EPSS 7.6% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • mit kerberos_5 1.6.4
  • mit krb5 1.6.4
  • krb5 Debian 14, Debian 13, Debian 12 1.8+dfsg~alpha1-1

debian advisories DEBIAN-CVE-2009-4212

  • krb5 RHEL 3 1.2.7-71
  • krb5 RHEL 4 1.3.4-62.el4_8.1
  • krb5 RHEL 5 1.6.1-36.el5_4.1
  • krb5-libs RHEL 3 1.2.7-71
  • krb5-libs RHEL 4 1.3.4-62.el4_8.1
  • krb5-libs RHEL 5 1.6.1-36.el5_4.1
  • krb5 RHEL 4.7 EUS 1.3.4-60.el4_7.3
  • krb5 RHEL 5.2 EUS 1.6.1-25.el5_2.3

red hat advisories RHSA-2010:0029

  • krb5 openSUSE Tumbleweed 1.15-1.1

opensuse advisories openSUSE-SU-2024:10004-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-4212 updated cvss 10.0

krb: KDC integer overflows in AES and RC4 decryption routines (MITKRB5-SA-2009-004)

  • Red Hat Desktop version 3 krb5 1.2.7-71, krb5-libs 1.2.7-71, krb5-server 1.2.7-71, krb5-workstation 1.2.7-71 Red Hat Enterprise Linux (v. 5 server) krb5 1.6.1-36.el5_4.1, krb5-libs 1.6.1-36.el5_4.1, krb5-server 1.6.1-36.el5_4.1, krb5-workstation 1.6.1-36.el5_4.1 Red Hat Enterprise Linux AS EUS (v. 4.7) krb5 1.3.4-60.el4_7.3, krb5-libs 1.3.4-60.el4_7.3, krb5-server 1.3.4-60.el4_7.3, krb5-workstation 1.3.4-60.el4_7.3 Red Hat Enterprise Linux AS version 3 krb5 1.2.7-71, krb5-libs 1.2.7-71, krb5-server 1.2.7-71, krb5-workstation 1.2.7-71 Red Hat Enterprise Linux AS version 4 krb5 1.3.4-62.el4_8.1, krb5-libs 1.3.4-62.el4_8.1, krb5-server 1.3.4-62.el4_8.1, krb5-workstation 1.3.4-62.el4_8.1 Red Hat Enterprise Linux Desktop (v. 5 client) krb5 1.6.1-36.el5_4.1, krb5-libs 1.6.1-36.el5_4.1, krb5-workstation 1.6.1-36.el5_4.1
    +9 more products
    Red Hat Enterprise Linux Desktop version 4 krb5 1.3.4-62.el4_8.1, krb5-libs 1.3.4-62.el4_8.1, krb5-server 1.3.4-62.el4_8.1, krb5-workstation 1.3.4-62.el4_8.1 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) krb5 1.6.1-36.el5_4.1, krb5-server 1.6.1-36.el5_4.1 Red Hat Enterprise Linux ES EUS (v. 4.7) krb5 1.3.4-60.el4_7.3, krb5-libs 1.3.4-60.el4_7.3, krb5-server 1.3.4-60.el4_7.3, krb5-workstation 1.3.4-60.el4_7.3 Red Hat Enterprise Linux ES version 3 krb5 1.2.7-71, krb5-libs 1.2.7-71, krb5-server 1.2.7-71, krb5-workstation 1.2.7-71 Red Hat Enterprise Linux ES version 4 krb5 1.3.4-62.el4_8.1, krb5-libs 1.3.4-62.el4_8.1, krb5-server 1.3.4-62.el4_8.1, krb5-workstation 1.3.4-62.el4_8.1 Red Hat Enterprise Linux EUS (v. 5.2 server) krb5 1.6.1-25.el5_2.3, krb5-libs 1.6.1-25.el5_2.3, krb5-server 1.6.1-25.el5_2.3, krb5-workstation 1.6.1-25.el5_2.3 Red Hat Enterprise Linux EUS (v. 5.3 server) krb5 1.6.1-31.el5_3.4, krb5-libs 1.6.1-31.el5_3.4, krb5-server 1.6.1-31.el5_3.4, krb5-workstation 1.6.1-31.el5_3.4 Red Hat Enterprise Linux WS version 3 krb5 1.2.7-71, krb5-libs 1.2.7-71, krb5-server 1.2.7-71, krb5-workstation 1.2.7-71 Red Hat Enterprise Linux WS version 4 krb5 1.3.4-62.el4_8.1, krb5-libs 1.3.4-62.el4_8.1, krb5-server 1.3.4-62.el4_8.1, krb5-workstation 1.3.4-62.el4_8.1
    fixed: vendor fix RHSA-2010:0029

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.55% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Improve kerberos 5 affected range consistency.