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CVE-2012-5521

21
FAUCET Score

CVE-2012-5521 describes a Denial of Service (DoS) vulnerability in the ospf6d daemon of Quagga 0.99.21, affecting various Debian and Red Hat Linux distributions. This medium-severity flaw (CVSS 6.5) can be exploited by an unauthenticated attacker on an adjacent network with low attack complexity, leading to high availability impact. There is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.99.21CPE matchmatch criteria
cpe:2.3:a:quagga:quagga:0.99.21:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.49%
Probability of exploitation in next 30 days
EPSS Percentile
71.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0149 is in the 94th percentile among its peer group of 1,802 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 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 5Fixed in: quagga
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: quagga

Vendor Advisories (1)

redhatCVE-2012-5521Low

(ospf6d): Assertion failure when removing routes (retrieving information which route to remove)

Nov 13, 2012

References

access.redhat.com / security/cve/cve-2012-5521
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
bugzilla.suse.com / show_bug.cgi
Issue TrackingThird Party Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/80096
Third Party AdvisoryVDB Entry
security-tracker.debian.org / tracker/CVE-2012-5521
Third Party Advisory
openwall.com / lists/oss-security/2012/11/13/14
Mailing ListThird Party Advisory
securityfocus.com / bid/56530
Third Party AdvisoryVDB Entry