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Vulnerability record · CVE-2017-16227 · published 29 October 2017

CVE-2017-16227: Quagga improper input validation vulnerability

Quagga · Quagga

The aspath_put function in bgpd/bgp_aspath.c in Quagga before 1.2.2 allows remote attackers to cause a denial of service (session drop) via BGP UPDATE messages, because AS_PATH size calculation for long paths counts certain bytes twice and consequently constructs an invalid message.

7.5 CVSS 3.0 High EPSS 19% · top 2.8% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

The aspath_put function in bgpd/bgp_aspath.c in Quagga before 1.2.2 allows remote attackers to cause a denial of service (session drop) via BGP UPDATE messages, because AS_PATH size calculation for long paths counts certain bytes twice and consequently constructs an invalid message.

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

Affected products

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

References

LinkTags
http://download.savannah.gnu.org/releases/quagga/quagga-1.2.2.changelog.txt Issue TrackingThird Party Advisory
http://www.debian.org/security/2017/dsa-4011 Issue TrackingThird Party Advisory
https://bugs.debian.org/879474 Issue TrackingPatchThird Party Advisory
https://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7a42b78be9a4108d98833069a88e6fddb9285008 Issue TrackingPatchThird Party Advisory
https://lists.quagga.net/pipermail/quagga-dev/2017-September/033284.html Issue TrackingPatchThird Party Advisory
http://download.savannah.gnu.org/releases/quagga/quagga-1.2.2.changelog.txt Issue TrackingThird Party Advisory
http://www.debian.org/security/2017/dsa-4011 Issue TrackingThird Party Advisory
https://bugs.debian.org/879474 Issue TrackingPatchThird Party Advisory
https://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7a42b78be9a4108d98833069a88e6fddb9285008 Issue TrackingPatchThird Party Advisory
https://lists.quagga.net/pipermail/quagga-dev/2017-September/033284.html Issue TrackingPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-16227), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.