Is CVE-2011-4862 in the CISA KEV catalog?

No. CVE-2011-4862 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4862?

CVE-2011-4862 has a CVSS v2 base score of 10.0 (HIGH).

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

CVE-2011-4862 has an EPSS score of 95.10% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4862?

Upgrade heimdal on debian 11 to 1.5.dfsg.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-4862

HIGHEPSS 100th pctl

10.0

CVSS v2

NVD

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.

CWE-120Classic Buffer Overflow

How to fix

Remediation Available

heimdalDebian

Fixed in:1.5.dfsg.1-1CVE-2011-4862

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

95.10%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

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%	-	-

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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.