How severe is CVE-2013-5480?

CVE-2013-5480 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2013-5480 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-5480?

CVE-2013-5480 primarily affects Cisco Ios. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-5480?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2013-5480 published?

CVE-2013-5480 was published on 2013-09-27 and last updated on 2026-06-16.

CVE-2013-5480

CVE-2013-5480 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Ios
Published: 2013-09-27
Last modified: 2026-06-16

Description

The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 DNS TCP stream, aka Bug ID CSCuf28733.

Frequently asked questions

What is CVE-2013-5480?: The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 DNS TCP stream, aka Bug ID CSCuf28733.
How severe is CVE-2013-5480?: CVE-2013-5480 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2013-5480 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5480?: CVE-2013-5480 primarily affects Cisco Ios. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5480?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2013-5480 published?: CVE-2013-5480 was published on 2013-09-27 and last updated on 2026-06-16.

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-nat

Affected products (5)

cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3:*:*:*:*:*:*:*

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