CVE-2013-1121 — The regex engine in the BGP implementation in Cisco NX-OS, when a complex regular expression is configured for inbound routes, allows remote attackers to cause a denial of service (device reload) via a crafted AS path set, aka Bug ID CSCuf49554

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MEDIUM

The regex engine in the BGP implementation in Cisco NX-OS, when a complex regular expression is configured for inbound routes, allows remote attackers to cause a denial of service (device reload) via a crafted AS path set, aka Bug ID CSCuf49554

Published Sep 19, 2013

5.4

MEDIUM

CVSS 2.0

EPSS 1.06%

Description

The regex engine in the BGP implementation in Cisco NX-OS, when a complex regular expression is configured for inbound routes, allows remote attackers to cause a denial of service (device reload) via a crafted AS path set, aka Bug ID CSCuf49554.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.06% 0.01060

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01060

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.06% (0.01060)	63.30th	v5 (v2026.06.15)
Jun 15, 2026	1.06% (0.01060)	60.01th	v5 (v2026.06.15)
Mar 17, 2025	0.43% (0.00427)	60.26th	v4 (v2025.03.14)
Dec 12, 2024	0.16% (0.00161)	54.06th	v3 (v2023.03.01)
Apr 25, 2024	0.14% (0.00137)	48.64th	v3 (v2023.03.01)
Mar 15, 2024	0.13% (0.00127)	46.29th	v3 (v2023.03.01)
Feb 8, 2024	0.11% (0.00115)	43.86th	v3 (v2023.03.01)
Mar 7, 2023	0.19% (0.00187)	54.31th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-399

References (1)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1121
vendor-advisoryx_refsource_CISCOVendor Advisory

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1121		vendor-advisoryx_refsource_CISCOVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Sep 19, 2013

Updated Sep 16, 2024

Reserved Jan 11, 2013

Link CVE-2013-1121

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2013-1121

Red Hat

Severity n/a

Public date n/a

Links CVE-2013-1121