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Vulnerability record · CVE-2017-5495 · published 24 January 2017

CVE-2017-5495: Quagga memory buffer overflow vulnerability

Quagga · Quagga

All versions of Quagga, 0.93 through 1.1.0, are vulnerable to an unbounded memory allocation in the telnet 'vty' CLI, leading to a Denial-of-Service of Quagga daemons, or even the entire host. When Quagga daemons are configured with their telnet CLI enabled, anyone who can connect to the TCP ports can trigger this vulnerability, prior to authentication. Most distributions restrict the Quagga telnet interface to local access only by default. The Quagga telnet interface 'vty' input buffer grows automatically, without bound, so long as a newline is not entered. This allows an attacker to cause the Quagga daemon to allocate unbounded memory by sending very long strings without a newline. Eventually the daemon is terminated by the system, or the system itself runs out of memory. This is fixed in Quagga 1.1.1 and Free Range Routing (FRR) Protocol Suite 2017-01-10.

7.5 CVSS 3.0 High EPSS 19% · top 2.8% CWE-119 · Memory buffer overflow
7.5CVSS 3.0 base score, v2 7.8
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

All versions of Quagga, 0.93 through 1.1.0, are vulnerable to an unbounded memory allocation in the telnet 'vty' CLI, leading to a Denial-of-Service of Quagga daemons, or even the entire host. When Quagga daemons are configured with their telnet CLI enabled, anyone who can connect to the TCP ports can trigger this vulnerability, prior to authentication. Most distributions restrict the Quagga telnet interface to local access only by default. The Quagga telnet interface 'vty' input buffer grows automatically, without bound, so long as a newline is not entered. This allows an attacker to cause the Quagga daemon to allocate unbounded memory by sending very long strings without a newline. Eventually the daemon is terminated by the system, or the system itself runs out of memory. This is fixed in Quagga 1.1.1 and Free Range Routing (FRR) Protocol Suite 2017-01-10.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

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

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2017-0794.html
http://savannah.nongnu.org/forum/forum.php?forum_id=8783 Release NotesVendor Advisory
http://www.securityfocus.com/bid/95745
http://www.securitytracker.com/id/1037688
https://github.com/freerangerouting/frr/pull/63 PatchVendor Advisory
https://lists.quagga.net/pipermail/quagga-dev/2017-January/016586.html
http://rhn.redhat.com/errata/RHSA-2017-0794.html
http://savannah.nongnu.org/forum/forum.php?forum_id=8783 Release NotesVendor Advisory
http://www.securityfocus.com/bid/95745
http://www.securitytracker.com/id/1037688
https://github.com/freerangerouting/frr/pull/63 PatchVendor Advisory
https://lists.quagga.net/pipermail/quagga-dev/2017-January/016586.html

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

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Source: NIST National Vulnerability Database (record CVE-2017-5495), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.