CVE-2013-5543

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-10-31 · updated 2026-06-16
Weakness: CWE-20

Description

Cisco IOS XE 3.4 before 3.4.2S and 3.5 before 3.5.1S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) via malformed ICMP error packets associated with a (1) TCP or (2) UDP session that is under inspection by the Zone-Based Firewall (ZBFW) component, aka Bug ID CSCtt26470.

Affected products

Cisco Asr 1001: all versions
Cisco Asr 1002: all versions
Cisco Asr 1002-X: all versions
Cisco Asr 1004: all versions
Cisco Asr 1006: all versions
Cisco Asr 1023 Router: all versions
Cisco IOS XE: 3.4.0as, 3.4.0s, 3.4.1s

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131030-asr1000
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131030-asr1000

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