CVE-2017-16227

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 46.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-10-29 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Debian Linux: 8.0, 9.0
quagga: through 1.2.1

References

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

Get alerted when CVE-2017-16227 or the next vulnerability affects your stack