Is CVE-2005-0021 in the CISA KEV catalog?

No. CVE-2005-0021 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2005-0021?

CVE-2005-0021 has a CVSS v2 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2005-0021?

CVE-2005-0021 has an EPSS score of 2.62% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2005-0021?

Upgrade exim4 on debian 11 to 4.34-10 or later.

CVE & CISA-KEV Catalog

CVE-2005-0021

HIGHEPSS 84th pctl

7.2

CVSS v2

NVD

Description

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

How to fix

Remediation Available

exim4Debian

Fixed in:4.34-10CVE-2005-0021

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

2.62%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch2

Exploit1

idefense.com

Vendor Advisory4

Other references3

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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 2026-04-16.