How severe is CVE-2011-4862?

No CVSS score has been assigned to CVE-2011-4862 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2011-4862?

Affected package information for CVE-2011-4862 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2011-4862?

No fixed version has been published for CVE-2011-4862 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2011-4862 actively exploited in the wild?

Yes. There are 10 known exploit references for CVE-2011-4862, including 3 documented proof-of-concept exploits on Exploit-DB and 6 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2011-4862?

CVE-2011-4862 has an EPSS (Exploit Prediction Scoring System) score of 92.6%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2011-4862?

CVE-2011-4862 is classified as CWE-120 (CWE-120). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2011-4862 published, and has it been updated?

CVE-2011-4862 was published on December 25, 2011 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2011-4862

Published

Dec 25, 2011

Updated

Apr 10, 2026

Affected

0 pkgs

Patched

None yet

Exploits

10 known

EPSS Exploitation Probability

via FIRST.org ↗

92.6%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-18369remotebsd✓ Verified

FreeBSD - Telnet Service Encryption Key ID Buffer Overflow (Metasploit)

by Metasploit · Jan 14, 2012

Exploit-DB Source

EDB-18280remotelinux✓ Verified

TelnetD encrypt_keyid - Function Pointer Overwrite

by NighterMan & BatchDrake · Dec 26, 2011

Exploit-DB Source

EDB-18368remotelinux✓ Verified

Linux BSD-derived Telnet Service Encryption Key ID - Remote Buffer Overflow (Metasploit)

by Metasploit · Jan 14, 2012

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2011-4862 in your stack?

O3 detects CVE-2011-4862 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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