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CVE-2020-3118: Cisco IOS XR Software Discovery Protocol Format String Vulnerability

criticalknown exploitedCVE-2020-3118
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 XR improperly validates string input from certain fields in Cisco Discovery Protocol messages. Exploitation could allow an unauthenticated, adjacent attacker to execute code with administrative privileges or cause a reload on an affected device.

CSIRTS triage

vendor: Ciscoproduct: IOS XRRemote code execution
What
Cisco IOS XR improperly validates string input from certain fields in Cisco Discovery Protocol messages, allowing code execution.
Who is affected
Affected devices running Cisco IOS XR.
Urgency
Urgent remediation is required due to active exploitation and critical severity.
Action
Update to the latest version of Cisco IOS XR.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-3118

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-2020-3118coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco IOS XR

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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