CVE-2003-0795
The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub...
CVE-2003-0795 is a medium vulnerability (CVSS 5.0) in Gnu Zebra, published November 18, 2003. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.43%, the 94th percentile. No source names a fixed version.
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2003-0795- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2003-0795- Updated
- 2026-11-02
EUVDEUVD-2003-0786 No score
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.
- Record
EUVD-2003-0786- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-77hp-5q78-94cv No score
The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub...
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.
- Record
GHSA-77hp-5q78-94cv- Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | GNU Zebra 0.9x / Quagga 0.96 - Remote Denial of Service | 2003-11-12 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, Exploit-DB, GitHub Advisories, NVD |