CVE-2024-20257 [Medium] | XSS in Asyncos

A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an authenticated, remote attacker to conduct an XSS attack against a user of the interface.r This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.18%	0.12%	-0.05%
2	2025-11-18	0.09%	0.18%	+0.09%
3	2025-08-07	—	0.09%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.18%

0.12%

-0.05%

2025-11-18

0.09%

0.18%

+0.09%

2025-08-07

—

0.09%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.8	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N` 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:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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:N) Service keeps running; no real outage angle.	1.7	2.7	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.8

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N 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:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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:N): Service keeps running; no real outage angle.

1.7

2.7

[email protected]

Affected software / configurations for CVE-2024-20257

Vendor	Product	Version	Raw CPE
cisco	asyncos	11.0.3-238	cpe:2.3:o:cisco:asyncos:11.0.3-238:::::::*
cisco	asyncos	11.1.0-069	cpe:2.3:o:cisco:asyncos:11.1.0-069:::::::*
cisco	asyncos	11.1.0-128	cpe:2.3:o:cisco:asyncos:11.1.0-128:::::::*
cisco	asyncos	11.1.0-131	cpe:2.3:o:cisco:asyncos:11.1.0-131:::::::*
cisco	asyncos	12.0.0-419	cpe:2.3:o:cisco:asyncos:12.0.0-419:::::::*
cisco	asyncos	12.1.0-071	cpe:2.3:o:cisco:asyncos:12.1.0-071:::::::*
cisco	asyncos	12.1.0-087	cpe:2.3:o:cisco:asyncos:12.1.0-087:::::::*
cisco	asyncos	12.1.0-089	cpe:2.3:o:cisco:asyncos:12.1.0-089:::::::*
cisco	asyncos	12.5.0-066	cpe:2.3:o:cisco:asyncos:12.5.0-066:::::::*
cisco	asyncos	12.5.3-041	cpe:2.3:o:cisco:asyncos:12.5.3-041:::::::*
cisco	asyncos	12.5.4-041	cpe:2.3:o:cisco:asyncos:12.5.4-041:::::::*
cisco	asyncos	13.0.0-392	cpe:2.3:o:cisco:asyncos:13.0.0-392:::::::*
cisco	asyncos	13.0.5-007	cpe:2.3:o:cisco:asyncos:13.0.5-007:::::::*
cisco	asyncos	13.5.1-277	cpe:2.3:o:cisco:asyncos:13.5.1-277:::::::*
cisco	asyncos	13.5.4-038	cpe:2.3:o:cisco:asyncos:13.5.4-038:::::::*
cisco	asyncos	14.0.0-698	cpe:2.3:o:cisco:asyncos:14.0.0-698:::::::*
cisco	asyncos	14.2.0-620	cpe:2.3:o:cisco:asyncos:14.2.0-620:::::::*
cisco	asyncos	14.2.1-020	cpe:2.3:o:cisco:asyncos:14.2.1-020:::::::*
cisco	asyncos	14.3.0-032	cpe:2.3:o:cisco:asyncos:14.3.0-032:::::::*
cisco	asyncos	15.0.0-104	cpe:2.3:o:cisco:asyncos:15.0.0-104:::::::*
cisco	asyncos	15.0.1-030	cpe:2.3:o:cisco:asyncos:15.0.1-030:::::::*
cisco	asyncos	15.5.0-048	cpe:2.3:o:cisco:asyncos:15.5.0-048:::::::*

References for CVE-2024-20257

URL	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-wsa-xss-bgG5WHOD	Vendor Advisory

URL

CVE-2024-20257

Exploit prediction scoring system (EPSS) score for CVE-2024-20257

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20257

Weakness enumeration for CVE-2024-20257

Affected software / configurations for CVE-2024-20257

References for CVE-2024-20257