Is CVE-2003-0688 in the CISA KEV catalog?

No. CVE-2003-0688 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2003-0688?

CVE-2003-0688 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2003-0688?

CVE-2003-0688 has an EPSS score of 3.34% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2003-0688?

Upgrade sendmail on debian 11 to 8.12.9 or later.

CVE & CISA-KEV Catalog

CVE-2003-0688

MEDIUMEPSS 87th pctl

5.0

CVSS v2

NVD

Description

The DNS map code in Sendmail 8.12.8 and earlier, when using the "enhdnsbl" feature, does not properly initialize certain data structures, which allows remote attackers to cause a denial of service (process crash) via an invalid DNS response that causes Sendmail to free incorrect data.

How to fix

Remediation Available

sendmailDebian

Fixed in:8.12.9CVE-2003-0688

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

3.34%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

redhat.com

Government Resource1

kb.cert.org

Other references5

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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.