CVE-2021-1397 [Medium] | Input Validation Bypass in Integrated Management Con…

A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the parameters in an HTTP request. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to redirect a user to a malicious website. This vulnerability is known as an open redirect attack, which is used in phishing attacks to get users to visit malicious sites without their knowledge.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.17%	0.83%	+0.67%
2	2025-03-17	0.11%	0.17%	+0.05%
3	2023-03-07	—	0.11%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.17%

0.83%

+0.67%

2025-03-17

0.11%

0.17%

+0.05%

2023-03-07

—

0.11%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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: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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. 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.	2.8	1.4	[email protected]
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/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: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: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.	2.8	2.7	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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: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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
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.

2.8

1.4

[email protected]

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/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: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: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.

2.8

2.7

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

4.9

[email protected]

Affected software / configurations for CVE-2021-1397

Vendor	Product	Version	Raw CPE
cisco	integrated_management_controller	< 3.2\(12.4\)	cpe:2.3:a:cisco:integrated_management_controller::::::::
cisco	ucs_manager	<= 4.1\(3b\)	cpe:2.3:a:cisco:ucs_manager::::::::
cisco	encs_5100_firmware	<= 4.4.2	cpe:2.3:o:cisco:encs_5100_firmware::::::::
cisco	encs_5400_firmware	<= 4.4.2	cpe:2.3:o:cisco:encs_5400_firmware::::::::
cisco	c220_m6_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c220_m6_firmware::::::::
cisco	c225_m6_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c225_m6_firmware::::::::
cisco	c240_m6_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c240_m6_firmware::::::::
cisco	c245_m6_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c245_m6_firmware::::::::
cisco	c125_m5_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c125_m5_firmware::::::::
cisco	c220_m5_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c220_m5_firmware::::::::
cisco	c240_m5_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c240_m5_firmware::::::::
cisco	c480_m5_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c480_m5_firmware::::::::
cisco	c480_ml_m5_firmware	<= 4.1\(2f\)	cpe:2.3:o:cisco:c480_ml_m5_firmware::::::::
cisco	ucs-e140s_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e140s_firmware::::::::
cisco	ucs-e140d_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e140d_firmware::::::::
cisco	ucs-e160d_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e160d_firmware::::::::
cisco	ucs-e160s-m3_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e160s-m3_firmware::::::::
cisco	ucs-e180d-m3_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e180d-m3_firmware::::::::
cisco	ucs-e1120d-m3_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e1120d-m3_firmware::::::::
cisco	ucs-e140s-m2_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e140s-m2_firmware::::::::
cisco	ucs-e180d-m2_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e180d-m2_firmware::::::::
cisco	ucs-e140s-m1_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e140s-m1_firmware::::::::
cisco	ucs-e140dp_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e140dp_firmware::::::::
cisco	ucs-e160dp-m1_firmware	<= 3.2\(11.5\)	cpe:2.3:o:cisco:ucs-e160dp-m1_firmware::::::::
cisco	ucs_s3260_firmware	<= 4.0\(2o\)	cpe:2.3:o:cisco:ucs_s3260_firmware::::::::

References for CVE-2021-1397

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-imc-openred-zAYrU6d2	Vendor Advisory

URL

CVE-2021-1397 | Cisco Integrated Management Controller Open Redirect Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2021-1397

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1397

Weakness enumeration for CVE-2021-1397

Affected software / configurations for CVE-2021-1397

References for CVE-2021-1397