CVE-2024-20484

Cisco Enterprise Chat and Email Denial of Service Vulnerability

Published Nov 6, 2024 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Description

A vulnerability in the External Agent Assignment Service (EAAS) feature of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to insufficient validation of Media Routing Peripheral Interface Manager (MR PIM) traffic that is received by an affected device. An attacker could exploit this vulnerability by sending crafted MR PIM traffic to an affected device. A successful exploit could allow the attacker to trigger a failure on the MR PIM connection between Cisco ECE and Cisco Unified Contact Center Enterprise (CCE), leading to a DoS condition on EAAS that would prevent customers from starting chat, callback, or delayed callback sessions. Note: When the attack traffic stops, the EAAS process must be manually restarted to restore normal operation. To restart the process in the System Console, choose Shared Resources > Services > Unified CCE > EAAS, then click Start.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Enterprise Chat and Email

unknown

Version	Status	Constraints
`11.6(1)_ES3`	affected	—
`11.6(1)_ES4`	affected	—
`12.0(1)_ES6`	affected	—
`11.6(1)_ES9`	affected	—
`11.6(1)_ES6`	affected	—
`11.6(1)_ES5`	affected	—
`12.5(1)_ET1`	affected	—
`12.5(1)_ES3_ET1`	affected	—
`12.0(1)_ES3`	affected	—
`11.6(1)_ES11`	affected	—
`12.0(1)_ES4`	affected	—
`12.0(1)_ES5`	affected	—
`11.6(1)_ES2`	affected	—
`11.6(1)_ES9a`	affected	—
`11.6(1)_ES10`	affected	—
`12.0(1)_ES1`	affected	—
`12.0(1)`	affected	—
`12.5(1)_ES3`	affected	—
`12.6(1)`	affected	—
`11.5(1)`	affected	—
`12.0(1)_ES2`	affected	—
`11.6(1)_ES7`	affected	—
`12.6(1)_ET1`	affected	—
`11.6(1)`	affected	—
`12.6(1)_ET2`	affected	—
`12.5(1)_ES3_ET2`	affected	—
`12.0(1)_ES6_ET2`	affected	—
`12.6(1)_ES1`	affected	—
`11.6(1)_ES12`	affected	—
`12.6(1)_ET3`	affected	—
`12.5(1)_ES4_ET1`	affected	—
`12.0(1)_ES6_ET3`	affected	—
`12.6(1)_ES1_ET1`	affected	—
`12.6(1)_ES2`	affected	—
`12.6_ES2_ET1`	affected	—
`12.5(1)_ES5`	affected	—
`12.6_ES2_ET2`	affected	—
`12.0(1)_ES7`	affected	—
`12.6_ES2_ET3`	affected	—
`12.0(1)_ES7_ET1`	affected	—
`12.5(1)_ES5_ET1`	affected	—
`12.6_ES2_ET4`	affected	—
`12.6(1)_ES3`	affected	—
`11.6(1)_ES12_ET1`	affected	—
`12.6_ES3_ET1`	affected	—
`12.6_ES3_ET2`	affected	—
`12.6(1)_ES4`	affected	—
`12.5(1)_ES7`	affected	—
`12.6(1)_ES4_ET1`	affected	—
`12.6(1)_ES5`	affected	—
`12.6(1)_ES5_ET1`	affected	—
`12.6(1)_ES5_ET2`	affected	—
`12.6(1)_ES6`	affected	—
`12.6(1)_ES6_ET1`	affected	—
`12.5(1)_ES8`	affected	—
`12.6(1)_ES6_ET2`	affected	—
`12.6(1)_ES7`	affected	—
`12.6(1)_ES8`	affected	—
`12.6(1)_ES4_ET2`	affected	—
`12.6(1)_ES3_ET3`	affected	—
`12.6(1)_ES2_ET5`	affected	—
`12.6(1)_ES1_ET2`	affected	—
`12.6(1)_ES8_ET1`	affected	—
`12.6(1)_ES7_ET1`	affected	—
`12.6(1)_ES6_ET3`	affected	—
`12.6(1)_ES5_ET3`	affected	—
`12.5(1)_ES8_ET1`	affected	—
`12.5(1)_ES3_ET3`	affected	—
`12.5(1)_ES5_ET2`	affected	—
`12.5(1)_ES6_ET1`	affected	—
`12.5(1)_ES4_ET2`	affected	—
`12.5(1)_ES7_ET1`	affected	—
`12.6(1)_ES8_ET2`	affected	—
`12.6(1)_ES9`	affected	—
`12.6(1)_ES9_ET1`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:cisco:enterprise_chat_and_email::::::::
	cpe:2.3:a:cisco:enterprise_chat_and_email::::::::

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2024-18199	A vulnerability in the External Agent Assignment Service (EAAS) feature of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of Media Routing Peripheral Interface Manager (MR PIM) traffic that is received by an affected device. An attacker could exploit this vulnerability by sending crafted MR PIM traffic to an affected device. A successful exploit could allow the attacker to trigger a failure on the MR PIM connection between Cisco ECE and Cisco Unified Contact Center Enterprise (CCE), leading to a DoS condition on EAAS that would prevent customers from starting chat, callback, or delayed callback sessions. Note: When the attack traffic stops, the EAAS process must be manually restarted to restore normal operation. To restart the process in the System Console, choose Shared Resources > Services > Unified CCE > EAAS, then click Start.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.635% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-dos-Oqb9uFEv

History

Jul 12, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.0015}`	epss `{'score': 0.00164}`

Apr 4, 2025 6:15 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		NVD-CWE-noinfo

Nov 6, 2024 6:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco enterprise Chat And Email
CPEs		cpe:2.3:a:cisco:enterprise_chat_and_email::::::::
Vendors & Products		Cisco Cisco enterprise Chat And Email
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Nov 6, 2024 4:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the External Agent Assignment Service (EAAS) feature of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of Media Routing Peripheral Interface Manager (MR PIM) traffic that is received by an affected device. An attacker could exploit this vulnerability by sending crafted MR PIM traffic to an affected device. A successful exploit could allow the attacker to trigger a failure on the MR PIM connection between Cisco ECE and Cisco Unified Contact Center Enterprise (CCE), leading to a DoS condition on EAAS that would prevent customers from starting chat, callback, or delayed callback sessions. Note: When the attack traffic stops, the EAAS process must be manually restarted to restore normal operation. To restart the process in the System Console, choose Shared Resources > Services > Unified CCE > EAAS, then click Start.
Title		Cisco Enterprise Chat and Email Denial of Service Vulnerability
Weaknesses		CWE-20
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-dos-Oqb9uFEv
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`