CVE-2003-0795

Zebra <= 0.93b - Denial of Service via Malformed Telnet Command

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2003-0795. PoCs published by Jonny Robertson.

AI-analyzed exploit summary This exploit targets a denial of service vulnerability in Zebra and Quagga by sending a malformed packet to the telnet management port, causing a crash due to a NULL pointer dereference. The PoC uses a simple printf command piped to netcat.

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.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Jonny Robertson · textdoslinux
https://www.exploit-db.com/exploits/23375

This exploit targets a denial of service vulnerability in Zebra and Quagga by sending a malformed packet to the telnet management port, causing a crash due to a NULL pointer dereference. The PoC uses a simple printf command piped to netcat.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: GNU Zebra (all versions), Quagga (< 0.96.4)
No auth needed
Prerequisites: network access to the telnet management port
mistral-large-3 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Patch, Vendor Advisory vendor-advisory x_refsource_redhat
http://www.redhat.com/support/errata/RHSA-2003-305.html
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=106883387304266&w=2
Patch, Vendor Advisory vendor-advisory x_refsource_debian
http://www.debian.org/security/2004/dsa-415
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/10563
Patch, Vendor Advisory vendor-advisory x_refsource_redhat
http://www.redhat.com/support/errata/RHSA-2003-307.html

Scores

EPSS 0.0823
EPSS Percentile 94.2%

Details

CWE
CWE-20
Status published
Products (11)
gnu/zebra 0.91a
gnu/zebra 0.92a
gnu/zebra 0.93a
gnu/zebra 0.93b
quagga/quagga 0.95
quagga/quagga 0.96
quagga/quagga 0.96.1
quagga/quagga 0.96.2
quagga/quagga < 0.96.3
sgi/propack 2.2.1
... and 1 more
Published Dec 15, 2003
Tracked Since Feb 18, 2026