CVE-2024-20474 [Medium] | Integer Overflow in Anyconnect Secure Mobilit…

A vulnerability in Internet Key Exchange version 2 (IKEv2) processing of Cisco Secure Client Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of Cisco Secure Client. This vulnerability is due to an integer underflow condition. An attacker could exploit this vulnerability by sending a crafted IKEv2 packet to an affected system. A successful exploit could allow the attacker to cause Cisco Secure Client Software to crash, resulting in a DoS condition on the client software. Note: Cisco Secure Client Software releases 4.10 and earlier were known as Cisco AnyConnect Secure Mobility Client.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-02	0.31%	0.60%	+0.29%
2	2025-12-01	0.10%	0.31%	+0.21%
3	2025-11-21	—	0.10%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-02

0.31%

0.60%

+0.29%

2025-12-01

0.10%

0.31%

+0.21%

2025-11-21

—

0.10%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L` 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.8	1.4	[email protected]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.3

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L 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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.8

1.4

[email protected]

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2024-20474

Vendor	Product	Version	Raw CPE
cisco	anyconnect_secure_mobility_client	4.9.00086	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.00086:::::::*
cisco	anyconnect_secure_mobility_client	4.9.01095	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.01095:::::::*
cisco	anyconnect_secure_mobility_client	4.9.02028	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.02028:::::::*
cisco	anyconnect_secure_mobility_client	4.9.03047	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.03047:::::::*
cisco	anyconnect_secure_mobility_client	4.9.03049	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.03049:::::::*
cisco	anyconnect_secure_mobility_client	4.9.04043	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.04043:::::::*
cisco	anyconnect_secure_mobility_client	4.9.04053	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.04053:::::::*
cisco	anyconnect_secure_mobility_client	4.9.05042	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.05042:::::::*
cisco	anyconnect_secure_mobility_client	4.9.06037	cpe:2.3:a:cisco:anyconnect_secure_mobility_client:4.9.06037:::::::*
cisco	secure_client	4.10.00093	cpe:2.3:a:cisco:secure_client:4.10.00093:::::::*
cisco	secure_client	4.10.01075	cpe:2.3:a:cisco:secure_client:4.10.01075:::::::*
cisco	secure_client	4.10.02086	cpe:2.3:a:cisco:secure_client:4.10.02086:::::::*
cisco	secure_client	4.10.03104	cpe:2.3:a:cisco:secure_client:4.10.03104:::::::*
cisco	secure_client	4.10.04065	cpe:2.3:a:cisco:secure_client:4.10.04065:::::::*
cisco	secure_client	4.10.04071	cpe:2.3:a:cisco:secure_client:4.10.04071:::::::*
cisco	secure_client	4.10.05085	cpe:2.3:a:cisco:secure_client:4.10.05085:::::::*
cisco	secure_client	4.10.05095	cpe:2.3:a:cisco:secure_client:4.10.05095:::::::*
cisco	secure_client	4.10.05111	cpe:2.3:a:cisco:secure_client:4.10.05111:::::::*
cisco	secure_client	4.10.06079	cpe:2.3:a:cisco:secure_client:4.10.06079:::::::*
cisco	secure_client	4.10.06090	cpe:2.3:a:cisco:secure_client:4.10.06090:::::::*
cisco	secure_client	4.10.07061	cpe:2.3:a:cisco:secure_client:4.10.07061:::::::*
cisco	secure_client	4.10.07062	cpe:2.3:a:cisco:secure_client:4.10.07062:::::::*
cisco	secure_client	4.10.07073	cpe:2.3:a:cisco:secure_client:4.10.07073:::::::*
cisco	secure_client	4.10.08025	cpe:2.3:a:cisco:secure_client:4.10.08025:::::::*
cisco	secure_client	4.10.08029	cpe:2.3:a:cisco:secure_client:4.10.08029:::::::*
cisco	secure_client	5.0.00238	cpe:2.3:a:cisco:secure_client:5.0.00238:::::::*
cisco	secure_client	5.0.00529	cpe:2.3:a:cisco:secure_client:5.0.00529:::::::*
cisco	secure_client	5.0.00556	cpe:2.3:a:cisco:secure_client:5.0.00556:::::::*
cisco	secure_client	5.0.01242	cpe:2.3:a:cisco:secure_client:5.0.01242:::::::*
cisco	secure_client	5.0.02075	cpe:2.3:a:cisco:secure_client:5.0.02075:::::::*
cisco	secure_client	5.0.03072	cpe:2.3:a:cisco:secure_client:5.0.03072:::::::*
cisco	secure_client	5.0.03076	cpe:2.3:a:cisco:secure_client:5.0.03076:::::::*
cisco	secure_client	5.0.04032	cpe:2.3:a:cisco:secure_client:5.0.04032:::::::*
cisco	secure_client	5.0.05040	cpe:2.3:a:cisco:secure_client:5.0.05040:::::::*
cisco	secure_client	5.1.0.136	cpe:2.3:a:cisco:secure_client:5.1.0.136:::::::*
cisco	secure_client	5.1.1.42	cpe:2.3:a:cisco:secure_client:5.1.1.42:::::::*
cisco	secure_client	5.1.2.42	cpe:2.3:a:cisco:secure_client:5.1.2.42:::::::*
cisco	secure_client	5.1.3.62	cpe:2.3:a:cisco:secure_client:5.1.3.62:::::::*

References for CVE-2024-20474

URL	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-csc-dos-XvPhM3bj	Vendor Advisory

URL

CVE-2024-20474

Exploit prediction scoring system (EPSS) score for CVE-2024-20474

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20474

Weakness enumeration for CVE-2024-20474

Affected software / configurations for CVE-2024-20474

References for CVE-2024-20474