Is CVE-2023-20233 in the CISA KEV catalog?

No. CVE-2023-20233 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-20233?

CVE-2023-20233 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2023-20233?

CVE-2023-20233 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-20233?

Upgrade ios xr to 7.8.2 or later.

CVE & CISA-KEV Catalog

CVE-2023-20233

MEDIUM

4.3

CVSS v3

NVD

Description

A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.

CWE-476NULL Pointer Dereference CWE-354

How to fix

Remediation Available

ios xrNVD

Affected:>= 7.8, < 7.8.2Fixed in:7.8.2CVE-2023-20233derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Vendor Advisory1

sec.cloudapps.cisco.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.