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Fencer Vulns
high 7.5

CVE-2017-5495 in the critical feed json

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-o…

published 2017-01-24 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14599

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
18.8%
EPSS 18.8% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

  • quagga Ubuntu 14.04 LTS 0.99.22.4-3ubuntu1.4
  • quagga Ubuntu 16.04 LTS 0.99.24.1-2ubuntu1.3

ubuntu advisories UBUNTU-CVE-2017-5495

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • quagga RHEL 6 0.99.15-14.el6
  • quagga-contrib RHEL 6 0.99.15-14.el6

red hat advisories RHSA-2017:0794

  • quagga SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 0.99.15-0.30.3.1
  • quagga SLES for SAP 12 SP1, SLES 12-LTSS, SLES 12 SP1-LTSS +1 more 0.99.22.1-16.4.1
  • quagga SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +4 more 1.1.1-17.3.3

suse advisories SUSE-SU-2018:0457-1SUSE-SU-2018:0455-1SUSE-SU-2017:2294-1

  • quagga openSUSE Tumbleweed 1.2.4-2.14

opensuse advisories openSUSE-SU-2024:11290-1

  • quagga Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 1.1.1-r0

alpine advisories ALPINE-CVE-2017-5495

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-5495 updated cvss 5.9

quagga: Telnet interface input buffer allocates unbounded amounts of memory

  • Red Hat Enterprise Linux 5 quagga Red Hat Enterprise Linux 7 quagga, quagga-contrib
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Server (v. 6) quagga 0.99.15-14.el6 Red Hat Enterprise Linux Server Optional (v. 6) quagga-contrib 0.99.15-14.el6 Red Hat Enterprise Linux Workstation (v. 6) quagga 0.99.15-14.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) quagga-contrib 0.99.15-14.el6
    fixed: vendor fix RHSA-2017:0794

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

18.80% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.