CVE-2024-20253

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.

Published: 2024-01-26 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20253 is rated High Risk (67.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.06%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-20253

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 1.95% 2.06% +0.11%
2 2026-06-15 3.03% 1.95% -1.08%
3 2026-03-16 — 3.03% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20253

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.3 [email protected]
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]

Weakness enumeration for CVE-2024-20253

Affected software / configurations for CVE-2024-20253

Vendor Product Version Raw CPE
cisco unified_communications_manager < 12.5\(1\)su8 cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
cisco unified_communications_manager >= 14.0, < 14su3 cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:*:*:*:*
cisco unified_communications_manager < 12.5\(1\)su8 cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
cisco unified_communications_manager >= 14.0, < 14su3 cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
cisco unified_communications_manager_im_and_presence_service < 12.5\(1\)su8 cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
cisco unified_communications_manager_im_and_presence_service >= 14.0, < 14.0su3 cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
cisco unity_connection < 12.5\(1\)su8 cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
cisco unity_connection >= 14.0, < 14su3 cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
cisco unified_contact_center_express 12.5\(1\) cpe:2.3:a:cisco:unified_contact_center_express:12.5\(1\):-:*:*:*:*:*:*
cisco virtualized_voice_browser 12.5\(1\) cpe:2.3:a:cisco:virtualized_voice_browser:12.5\(1\):*:*:*:*:*:*:*
cisco virtualized_voice_browser 12.6\(1\) cpe:2.3:a:cisco:virtualized_voice_browser:12.6\(1\):*:*:*:*:*:*:*
cisco virtualized_voice_browser 12.6\(2\) cpe:2.3:a:cisco:virtualized_voice_browser:12.6\(2\):*:*:*:*:*:*:*

References for CVE-2024-20253

cvelogic Threat Intelligence