CVE-2019-1974 [Critical] | Authentication Bypass in Integrated Management Con…

A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data could allow an unauthenticated, remote attacker to bypass user authentication and gain access as an administrative user. The vulnerability is due to insufficient request header validation during the authentication process. An attacker could exploit this vulnerability by sending a series of malicious requests to an affected device. An exploit could allow the attacker to gain full administrative access to the affected device.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	11.59%	4.49%	-7.10%
2	2025-06-23	14.97%	11.59%	-3.37%
3	2025-03-30	—	14.97%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

11.59%

4.49%

-7.10%

2025-06-23

14.97%

11.59%

-3.37%

2025-03-30

—

14.97%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big 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.	3.9	5.9	[email protected]
9.8	3.0	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big 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.	3.9	5.9	[email protected]
10.0	2.0	HIGH	`AV:N/AC:L/Au:N/C:C/I:C/A:C` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	10.0	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.0

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big 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.

3.9

5.9

[email protected]

9.8

3.0

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big 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.

3.9

5.9

[email protected]

10.0

2.0

HIGH

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

10.0

[email protected]

Affected software / configurations for CVE-2019-1974

Vendor	Product	Version	Raw CPE
cisco	integrated_management_controller_supervisor	>= 2.2.0.0, <= 2.2.0.6	cpe:2.3:a:cisco:integrated_management_controller_supervisor::::::::
cisco	integrated_management_controller_supervisor	2.1.0.0	cpe:2.3:a:cisco:integrated_management_controller_supervisor:2.1.0.0:::::::*
cisco	ucs_director	>= 5.5.0.0, <= 5.5.0.2	cpe:2.3:a:cisco:ucs_director::::::::
cisco	ucs_director	>= 6.0.0.0, <= 6.0.1.3	cpe:2.3:a:cisco:ucs_director::::::::
cisco	ucs_director	>= 6.5.0.0, <= 6.5.0.3	cpe:2.3:a:cisco:ucs_director::::::::
cisco	ucs_director	>= 6.6.0.0, <= 6.6.1.0	cpe:2.3:a:cisco:ucs_director::::::::
cisco	ucs_director	>= 6.7.0.0, <= 6.7.2.0	cpe:2.3:a:cisco:ucs_director::::::::
cisco	ucs_director	6.7\(1.1\)	cpe:2.3:a:cisco:ucs_director:6.7\(1.1\):::::::*
cisco	ucs_director	6.7\(2.0\)	cpe:2.3:a:cisco:ucs_director:6.7\(2.0\):::::::*
cisco	ucs_director_express_for_big_data	>= 2.1.0.0, <= 2.1.0.2	cpe:2.3:a:cisco:ucs_director_express_for_big_data::::::::
cisco	ucs_director_express_for_big_data	>= 3.0.0.0, <= 3.0.1.3	cpe:2.3:a:cisco:ucs_director_express_for_big_data::::::::
cisco	ucs_director_express_for_big_data	>= 3.5.0.0, <= 3.5.0.3	cpe:2.3:a:cisco:ucs_director_express_for_big_data::::::::
cisco	ucs_director_express_for_big_data	>= 3.7.0.0, <= 3.7.2.0	cpe:2.3:a:cisco:ucs_director_express_for_big_data::::::::
cisco	ucs_director_express_for_big_data	3.6.0.0	cpe:2.3:a:cisco:ucs_director_express_for_big_data:3.6.0.0:::::::*
cisco	ucs_director_express_for_big_data	3.6.1.0	cpe:2.3:a:cisco:ucs_director_express_for_big_data:3.6.1.0:::::::*

References for CVE-2019-1974

URL	Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-ucs-authbypass	Vendor Advisory

URL

CVE-2019-1974 | Cisco IMC Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data Authentication Bypass Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2019-1974

Common vulnerability scoring system (CVSS) metrics for CVE-2019-1974

Weakness enumeration for CVE-2019-1974

Affected software / configurations for CVE-2019-1974

References for CVE-2019-1974