How severe is CVE-2026-20200?

CVE-2026-20200 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-20200 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20200?

CVE-2026-20200 primarily affects Cisco Unified Computing System. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20200?

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-2026-20200 published?

CVE-2026-20200 was published on 2026-08-05 and last updated on 2026-08-31.

CVE-2026-20200

CVE-2026-20200 is a high-severity vulnerability in Cisco Unified Computing System with a CVSS 3.x base score of 8.8. 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-141.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-141
Affected product: Cisco Unified Computing System
Published: 2026-08-05
Last modified: 2026-08-31

Description

A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with low privileges to execute arbitrary commands on the underlying operating system of an affected system and elevate privileges to root.  This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by entering crafted inputs to the web-based management interface of the affected software. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system as the root user. 

Frequently asked questions

What is CVE-2026-20200?: A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with low privileges to execute arbitrary commands on the underlying operating system of an affected system and elevate privileges to root.  This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by entering crafted inputs to the web-based management interface of the affected software. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system as the root user. 
How severe is CVE-2026-20200?: CVE-2026-20200 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20200 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20200?: CVE-2026-20200 primarily affects Cisco Unified Computing System. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20200?: 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-2026-20200 published?: CVE-2026-20200 was published on 2026-08-05 and last updated on 2026-08-31.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-arg-inject-upSHdMfU

Affected products (38)

cpe:2.3:a:cisco:unified_computing_system:4.3\(1.230097\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(1.230124\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(1.230138\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(2.230207\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(2.230270\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(2.240002\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(3.240022\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(3.240043\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.240142\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.240152\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.241014\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.241063\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.242028\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.242038\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.242066\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.252001\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(4.252002\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.240021\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.250001\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.250030\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.250033\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.250043\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(5.250045\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250039\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250040\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250044\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250053\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250060\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250101\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.250117\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.260003\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:4.3\(6.260017\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250127\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250130\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250131\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250174\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250192\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:6.0\(1.250194\):*:*:*:*:*:*:*

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