Is CVE-2024-20253 in the CISA KEV catalog?

No. CVE-2024-20253 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-20253?

CVE-2024-20253 has a CVSS v3 base score of 9.9 (CRITICAL).

What is the EPSS score for CVE-2024-20253?

CVE-2024-20253 has an EPSS score of 2.06% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-20253?

Upgrade unified communications manager to 14su3 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2024-20253

CRITICALEPSS 79th pctl

9.9

CVSS v3

NVD

Description

A vulnerability in multiple Cisco Unified Communications and Contact Center Solutions products could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to the improper processing of user-provided data that is being read into memory. An attacker could exploit this vulnerability by sending a crafted message to a listening port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with the privileges of the web services user. With access to the underlying operating system, the attacker could also establish root access on the affected device.

CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

unified communications managerNVD

Affected:>= 14.0, < 14su3Fixed in:14su3CVE-2024-20253derived from NVD

Affected:< 12.5(1)su8Fixed in:12.5(1)su8CVE-2024-20253derived from NVD

unified communications manager im and presence serviceNVD

Affected:>= 14.0, < 14.0su3Fixed in:14.0su3CVE-2024-20253derived from NVD

unity connectionNVD

Affected:>= 14.0, < 14su3Fixed in:14su3CVE-2024-20253derived 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 InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

2.06%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Vendor Advisory1

sec.cloudapps.cisco.com

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-47986	Critical	9.8	100%	KEV + Ransom	-

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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 2025-05-29.