CVE-2020-3261 [Medium] | CSRF in Aironet 1542i Firmware

A vulnerability in the web-based management interface of Cisco Mobility Express Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack on an affected system. The vulnerability is due to insufficient CSRF protections for the web-based management interface on an affected device. An attacker could exploit this vulnerability by persuading a user with an active session on an affected device to follow a malicious link. A successful exploit could allow the attacker to perform arbitrary actions, including modifying the configuration, with the privilege level of the user.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.29%	0.50%	+0.21%
2	2025-11-21	0.15%	0.29%	+0.14%
3	2025-11-18	—	0.15%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.29%

0.50%

+0.21%

2025-11-21

0.15%

0.29%

+0.14%

2025-11-18

—

0.15%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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: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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]
8.1	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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: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: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.	2.8	5.2	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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: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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

8.1

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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: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: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.

2.8

5.2

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2020-3261

Vendor	Product	Version	Raw CPE
cisco	aironet_1542i_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1542i_firmware::::::::
cisco	aironet_1542i_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1542i_firmware:8.10\(1.255\):::::::*
cisco	aironet_1542d_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1542d_firmware::::::::
cisco	aironet_1542d_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1542d_firmware:8.10\(1.255\):::::::*
cisco	aironet_1562i_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1562i_firmware::::::::
cisco	aironet_1562i_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1562i_firmware:8.10\(1.255\):::::::*
cisco	aironet_1562e_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1562e_firmware::::::::
cisco	aironet_1562e_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1562e_firmware:8.10\(1.255\):::::::*
cisco	aironet_1562d_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1562d_firmware::::::::
cisco	aironet_1562d_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1562d_firmware:8.10\(1.255\):::::::*
cisco	aironet_1815_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1815_firmware::::::::
cisco	aironet_1815_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1815_firmware:8.10\(1.255\):::::::*
cisco	aironet_1830_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1830_firmware::::::::
cisco	aironet_1830_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1830_firmware:8.10\(1.255\):::::::*
cisco	aironet_1840_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1840_firmware::::::::
cisco	aironet_1840_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1840_firmware:8.10\(1.255\):::::::*
cisco	aironet_1850_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_1850_firmware::::::::
cisco	aironet_1850_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_1850_firmware:8.10\(1.255\):::::::*
cisco	aironet_2800i_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_2800i_firmware::::::::
cisco	aironet_2800i_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_2800i_firmware:8.10\(1.255\):::::::*
cisco	aironet_2800e_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_2800e_firmware::::::::
cisco	aironet_2800e_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_2800e_firmware:8.10\(1.255\):::::::*
cisco	aironet_3800i_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_3800i_firmware::::::::
cisco	aironet_3800i_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_3800i_firmware:8.10\(1.255\):::::::*
cisco	aironet_3800e_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_3800e_firmware::::::::
cisco	aironet_3800e_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_3800e_firmware:8.10\(1.255\):::::::*
cisco	aironet_3800p_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_3800p_firmware::::::::
cisco	aironet_3800p_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_3800p_firmware:8.10\(1.255\):::::::*
cisco	aironet_4800_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:aironet_4800_firmware::::::::
cisco	aironet_4800_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:aironet_4800_firmware:8.10\(1.255\):::::::*
cisco	catalyst_iw6300_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:catalyst_iw6300_firmware::::::::
cisco	catalyst_iw6300_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:catalyst_iw6300_firmware:8.10\(1.255\):::::::*
cisco	6300_series_access_points_firmware	>= 8.0, < 8.8.130.0	cpe:2.3:o:cisco:6300_series_access_points_firmware::::::::
cisco	6300_series_access_points_firmware	8.10\(1.255\)	cpe:2.3:o:cisco:6300_series_access_points_firmware:8.10\(1.255\):::::::*

References for CVE-2020-3261

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mob-exp-csrf-b8tFec24	Vendor Advisory

URL

CVE-2020-3261 | Cisco Mobility Express Software Cross-Site Request Forgery Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2020-3261

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3261

Weakness enumeration for CVE-2020-3261

Affected software / configurations for CVE-2020-3261

References for CVE-2020-3261