CVE-2003-0688

Sendmail vulnerability

CVSS

5.0

EPSS

3.6%

EPSS pct

88th

Exploited

No known

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.

Affected vendor

Redhat

Affected product

Sendmail

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Published

2003-10-20

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 3.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2003-0688

Confirm whether Redhat Sendmail is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2003-0688.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2003-0688

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2003-0688 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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