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Vulnerability record · CVE-2003-0795 · published 15 December 2003

CVE-2003-0795: Gnu zebra improper input validation vulnerability

Gnu · Zebra

The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.

5.0 CVSS 2.0 Medium EPSS 8.2% · top 5.3% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
8.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.

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

Affected products

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

References

LinkTags
http://marc.info/?l=bugtraq&m=106883387304266&w=2
http://secunia.com/advisories/10563 Vendor Advisory
http://www.debian.org/security/2004/dsa-415 PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-305.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-307.html PatchVendor Advisory
http://marc.info/?l=bugtraq&m=106883387304266&w=2
http://secunia.com/advisories/10563 Vendor Advisory
http://www.debian.org/security/2004/dsa-415 PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-305.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-307.html PatchVendor Advisory

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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-2003-0795), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.