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CVE-2020-3226

HIGH · CVSS 8.6EPSS 1.6%EU EUVD

A vulnerability in the Session Initiation Protocol (SIP) library of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient sanity checks on received SIP messages. An attacker could exploit this vulnerability by sending crafted SIP messages to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service condition.

Key facts

CVSS score
8.6 (v3.1)
Severity
HIGH
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE)
CWE-20
EPSS score
1.6% (75th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2020-24497)
Published
June 3, 2020
NVD last modified
June 17, 2026
Status
Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2020-24497 in the EU Vulnerability Database. Last updated in EUVD on November 15, 2024.

View on the EU Vulnerability Database

Affected products

  • cisco / ios
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  • cisco / ios
  • cisco / ios
  • cisco / ios

and 210 more…

Certified products that may be affected

3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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