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CVE-2013-1121

16
FAUCET Score

CVE-2013-1121 describes a denial-of-service vulnerability in the BGP implementation of Cisco NX-OS. A remote attacker can trigger a device reload by sending a crafted AS path set when a complex regular expression is configured for inbound routes. This vulnerability has a CVSS score of 5.4, indicating a medium severity due to its network-based attack vector and high attack complexity, leading to a complete loss of availability. There is no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not widely targeted.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.4MEDIUM

AV:N/AC:H/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
61.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 21st percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityNotice/CVE-2013-1121
Vendor Advisory