Description
The bgp_attr_unknown function in bgp_attr.c in Quagga 0.99.21 does not properly initialize the total variable, which allows remote attackers to cause a denial of service (bgpd crash) via a crafted BGP update.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | quagga | 0.99.22.4-1+wheezy1 | DSA-2803-1 |
| Debian 6.0 | quagga | 0.99.20.1-0+squeeze5 | DSA-2803-1 |
Advisories 1
- DSA-2803-1 quagga - several Debian Security (DSA / DLA) · Mar 9, 2026