CVE-2011-4862

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 93% probability of exploitation within the next 30 days (top 0.2% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 95%
CISA-KEV: Not listedEPSS: 95%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
—
EG Score
9.0(low)
EPSS
99.9%
KEV
Not listed

Published

December 25, 2011

Last Modified

April 29, 2026

References (84)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkrb5-0:1.6.1-55.el5_6.32011-12-28redhat
redhatkrb5-appl-0:1.0.1-2.el6_1.32011-12-28redhat
redhatkrb5-0:1.6.1-63.el5_72011-12-27redhat
redhatkrb5-appl-0:1.0.1-7.el6_22011-12-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 1× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-05 16:59 UTCOSV refresh
  2. 2026-06-27 03:05 UTCEPSS rescore
  3. 2026-06-27 03:05 UTCEPSS rescore
  4. 2026-06-23 21:30 UTCEPSS rescore
  5. 2026-06-22 14:22 UTCEPSS rescore
  6. 2026-06-22 14:22 UTCEPSS rescore
  7. 2026-06-21 01:56 UTCEPSS rescore
  8. 2026-06-21 01:56 UTCEPSS rescore
  9. 2026-06-17 04:14 UTCOSV refresh
  10. 2026-06-15 17:44 UTCEPSS rescore
  11. 2026-06-13 22:57 UTCEPSS rescore
  12. 2026-06-12 23:08 UTCEPSS rescore
  13. 2026-06-06 13:45 UTCEPSS rescore
  14. 2026-06-06 13:45 UTCEPSS rescore
  15. 2026-06-04 13:09 UTCEPSS rescore
  16. 2026-05-29 13:41 UTCEPSS rescore
  17. 2026-05-29 05:55 UTCEG score recompute
  18. 2026-05-29 05:55 UTCVendor advisory
  19. 2026-05-29 05:55 UTCGHSA enrichment
  20. 2026-05-26 13:41 UTCEPSS rescore
  21. 2026-05-26 13:41 UTCEPSS rescore
  22. 2026-05-24 16:43 UTCEPSS rescore
  23. 2026-05-22 21:15 UTCEPSS rescore
  24. 2026-05-22 21:15 UTCEPSS rescore
  25. 2026-05-22 21:15 UTCEPSS rescore
Show 5 more
  1. 2026-05-20 22:37 UTCEPSS rescore
  2. 2026-05-20 22:37 UTCEPSS rescore
  3. 2026-05-20 22:37 UTCEPSS rescore
  4. 2026-05-18 21:29 UTCEPSS rescore
  5. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(7 references)

Working exploit code is in the public domain (3 Metasploit modules) (1 GitHub PoC) (3 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoChdbreaker/GO-CVE-2011-4862
    First seen Feb 2, 2017

    Go Exploit for CVE-2011-4862

    Open source ↗
  • Exploit-DBEDB-18369✓ verified
    First seen Jan 14, 2012

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

    Open source ↗
  • Exploit-DBEDB-18368✓ verified
    First seen Jan 14, 2012

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

    Open source ↗
  • Exploit-DBEDB-18280✓ verified
    First seen Dec 26, 2011

    TelnetD encrypt_keyid - Function Pointer Overwrite

    Open source ↗
  • Metasploitexploit/freebsd/telnet/telnet_encrypt_keyid✓ verified
    First seen Dec 23, 2011

    FreeBSD Telnet Service Encryption Key ID Buffer Overflow

    Open source ↗
  • Metasploitexploit/linux/telnet/telnet_encrypt_keyid✓ verified
    First seen Dec 23, 2011

    Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow

    Open source ↗
  • Metasploitauxiliary/scanner/telnet/telnet_encrypt_overflow✓ verified
    First seen Jan 1, 2011

    Telnet Service Encryption Key ID Overflow Detection

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2011-4862?
CVE-2011-4862 is a none vulnerability published on December 25, 2011. 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…
When was CVE-2011-4862 disclosed?
CVE-2011-4862 was first published in the National Vulnerability Database on December 25, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-4862 actively exploited?
CVE-2011-4862 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-4862?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-4862, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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