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Vulnerability record · CVE-2003-0688 · published 20 October 2003

CVE-2003-0688: Redhat sendmail vulnerability

Redhat · Sendmail

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.

5.0 CVSS 2.0 Medium EPSS 3.6% · top 11.1%
5.0CVSS 2.0 base score
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
16References
16 Jun 2026Last modified by 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.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
ftp://patches.sgi.com/support/free/security/advisories/20030803-01-P
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000727
http://www.kb.cert.org/vuls/id/993452 US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2003:086
http://www.novell.com/linux/security/advisories/2003_035_sendmail.html
http://www.redhat.com/support/errata/RHSA-2003-265.html PatchVendor Advisory
http://www.sendmail.org/dnsmap1.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A597
ftp://patches.sgi.com/support/free/security/advisories/20030803-01-P
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000727
http://www.kb.cert.org/vuls/id/993452 US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2003:086
http://www.novell.com/linux/security/advisories/2003_035_sendmail.html
http://www.redhat.com/support/errata/RHSA-2003-265.html PatchVendor Advisory
http://www.sendmail.org/dnsmap1.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A597

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2003-0688), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.