CVE-2011-4862
HIGHEPSS 100th pctlDescription
Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.2 and earlier, Heimdal 1.5.1 and earlier, GNU inetutils, and possibly other products allows remote attackers to execute arbitrary code via a long encryption key, as exploited in the wild in December 2011.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Very high risk: more likely to be exploited than 100% of all known CVEs.
References
- lists.fedoraproject.org
- lists.fedoraproject.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- secunia.com
- debian.org
- debian.org
- debian.org
- mandriva.com
- redhat.com
- redhat.com
- redhat.com
- redhat.com
- securitytracker.com
- securitytracker.com
- exchange.xforce.ibmcloud.com
Related Vulnerabilities
Other CWE-120 (Classic Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2014-0195 | Medium | 6.8 | 100% | - | Fix |
| CVE-2017-7269 | Critical | 9.8 | 100% | KEV | - |
| CVE-2019-11043 | High | 8.7 | 99% | KEV + Ransom | Fix |
| CVE-2007-5659 | High | 7.8 | 94% | KEV | Fix |
| CVE-2022-3786 | High | 7.5 | 92% | - | Fix |
| CVE-2009-3023 | High | 9.0 | 91% | - | - |
Common questions
How do I fix CVE-2011-4862?
Upgrade heimdal on debian 11 to 1.5.dfsg.1-1 or later.
Is CVE-2011-4862 being actively exploited?
Not that we know of. CVE-2011-4862 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 95.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 100% of all scored CVEs.
How severe is CVE-2011-4862?
CVE-2011-4862 has a CVSS v2 base score of 10.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2011-4862 affect?
Published advisories record a fix for heimdal (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.