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CVE-2017-16227

33
FAUCET Score

CVE-2017-16227 is a denial-of-service vulnerability affecting Quagga versions prior to 1.2.2, specifically impacting Debian Linux distributions. Remote attackers can exploit this flaw by sending crafted BGP UPDATE messages, leading to session drops due to incorrect AS_PATH size calculations. Rated 7.5 HIGH on CVSS, this vulnerability is easily exploitable over the network with low complexity and no user interaction, resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.2.1CPE matchmatch criteria
cpe:2.3:a:quagga:quagga:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
18.79%
Probability of exploitation in next 30 days
EPSS Percentile
97.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1879 is in the 95th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: quagga
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: quagga

Vendor Advisories (1)

redhatCVE-2017-16227Moderate

quagga: Incorrect AS_PATH size calculation for long paths

Oct 2, 2017

References

download.savannah.gnu.org / releases/quagga/quagga-1.2.2.changelog.txt
Issue TrackingThird Party Advisory
bugs.debian.org / 879474
Issue TrackingPatchThird Party Advisory
git.savannah.gnu.org / cgit/quagga.git/commit
Issue TrackingPatchThird Party Advisory
lists.quagga.net / pipermail/quagga-dev/2017-September/033284.html
Issue TrackingPatchThird Party Advisory
debian.org / security/2017/dsa-4011
Issue TrackingThird Party Advisory