CVE-2022-20697

CVE-2022-20697 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 8.6. 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-772.

Key facts

• Severity: High (CVSS 3.x base score 8.6)
• CVSS v2: 6.8
• EPSS exploit prediction: 1% (62nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-772
• Affected product: Cisco Ios
• Published: 2022-04-15
• Last modified: 2026-06-17

Description

A vulnerability in the web services interface of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper resource management in the HTTP server code. An attacker could exploit this vulnerability by sending a large number of HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Frequently asked questions

What is CVE-2022-20697?

A vulnerability in the web services interface of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper resource management in the HTTP server code. An attacker could exploit this vulnerability by sending a large number of HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

How severe is CVE-2022-20697?

CVE-2022-20697 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-20697 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-20697?

CVE-2022-20697 primarily affects Cisco Ios. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-20697?

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-2022-20697 published?

CVE-2022-20697 was published on 2022-04-15 and last updated on 2026-06-17.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-dos-svOdkdBS

Affected products (29)

• cpe:2.3:o:cisco:ios:15.1\(3\)svr1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svr2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svr3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svs:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svs1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svt1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svt2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svt3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svu1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svu2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svu10:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.1\(3\)svv1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(7\)e3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(7\)e3a:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(7\)e3k:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(7\)e4:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(8\)e:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.2\(234k\)e:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.3\(3\)jk100:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.3\(3\)jpj8:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m2a:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m3a:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m3b:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:15.9\(3\)m4:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios_xe:3.11.3ae:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios_xe:3.11.3e:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios_xe:3.11.4e:*:*:*:*:*:*:*

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