Is CVE-2017-5495 actively exploited?

No active exploitation of CVE-2017-5495 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-5495 be exploited remotely?

Yes. CVE-2017-5495 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-5495?

CVE-2017-5495 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2017-5495

CWE-119Published: January 24, 2017· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2017-5495 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.