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CVE-2023-20273: Cisco IOS XE Web UI Command Injection Vulnerability

criticalknown exploitedpublic exploitCVE-2023-20273
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Cisco IOS XE contains a command injection vulnerability in the web user interface. When chained with CVE-2023-20198, the attacker can leverage the new local user to elevate privilege to root and write the implant to the file system. Cisco identified CVE-2023-20273 as the vulnerability exploited to deploy the implant. CVE-2021-1435, previously associated with the exploitation events, is no longer believed to be related to this activity.

CSIRTS triage

vendor: Ciscoproduct: IOS XECode injection
What
Cisco IOS XE contains a command injection vulnerability in the web user interface.
Who is affected
Deployments of Cisco IOS XE with the web UI enabled.
Urgency
Remediation is urgent as the vulnerability is actively exploited and is critical in severity.
Action
Apply the latest security updates to address this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-10-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-20273

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-20273coverage & exploitation statusNVD · CVE.org

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