CVE-2020-3243 [Critical] | Input Validation Bypass in Ucs Director

CVE-2020-3243 is rated High Risk (79.1/100): CVSS Critical severity, with high exploitation likelihood (EPSS 90.20%, 100th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +7.66% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-13	82.53%	90.20%	+7.66%
2	2025-11-21	88.94%	82.53%	-6.41%
3	2025-11-18	—	88.94%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-13

82.53%

90.20%

+7.66%

2025-11-21

88.94%

82.53%

-6.41%

2025-11-18

—

88.94%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/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]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` 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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/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]

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P 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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

Affected software / configurations for CVE-2020-3243

Vendor	Product	Version	Raw CPE
cisco	ucs_director	6.0.0.0	cpe:2.3:a:cisco:ucs_director:6.0.0.0:::::::*
cisco	ucs_director	6.0.0.1	cpe:2.3:a:cisco:ucs_director:6.0.0.1:::::::*
cisco	ucs_director	6.0.1.0	cpe:2.3:a:cisco:ucs_director:6.0.1.0:::::::*
cisco	ucs_director	6.0.1.1	cpe:2.3:a:cisco:ucs_director:6.0.1.1:::::::*
cisco	ucs_director	6.0.1.2	cpe:2.3:a:cisco:ucs_director:6.0.1.2:::::::*
cisco	ucs_director	6.0.1.3	cpe:2.3:a:cisco:ucs_director:6.0.1.3:::::::*
cisco	ucs_director	6.5.0.0	cpe:2.3:a:cisco:ucs_director:6.5.0.0:::::::*
cisco	ucs_director	6.5.0.1	cpe:2.3:a:cisco:ucs_director:6.5.0.1:::::::*
cisco	ucs_director	6.5.0.2	cpe:2.3:a:cisco:ucs_director:6.5.0.2:::::::*
cisco	ucs_director	6.5.0.3	cpe:2.3:a:cisco:ucs_director:6.5.0.3:::::::*
cisco	ucs_director	6.5.0.4	cpe:2.3:a:cisco:ucs_director:6.5.0.4:::::::*
cisco	ucs_director	6.6.0.0	cpe:2.3:a:cisco:ucs_director:6.6.0.0:::::::*
cisco	ucs_director	6.6.1.0	cpe:2.3:a:cisco:ucs_director:6.6.1.0:::::::*
cisco	ucs_director	6.6.2.0	cpe:2.3:a:cisco:ucs_director:6.6.2.0:::::::*
cisco	ucs_director	6.7.0.0	cpe:2.3:a:cisco:ucs_director:6.7.0.0:::::::*
cisco	ucs_director	6.7.1.0	cpe:2.3:a:cisco:ucs_director:6.7.1.0:::::::*
cisco	ucs_director	6.7.2.0	cpe:2.3:a:cisco:ucs_director:6.7.2.0:::::::*
cisco	ucs_director	6.7.3.0	cpe:2.3:a:cisco:ucs_director:6.7.3.0:::::::*
cisco	ucs_director_express_for_big_data	<= 3.7.3.0	cpe:2.3:a:cisco:ucs_director_express_for_big_data::::::::

References for CVE-2020-3243

URL	Tags
http://packetstormsecurity.com/files/157955/Cisco-UCS-Director-Cloupia-Script-Remote-Code-Execution.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsd-mult-vulns-UNfpdW4E	Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-540/	Third Party Advisory VDB Entry

URL

CVE-2020-3243 | Multiple Vulnerabilities in Cisco UCS Director and Cisco UCS Director Express for Big Data

Exploit prediction scoring system (EPSS) score for CVE-2020-3243

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3243

Weakness enumeration for CVE-2020-3243

Affected software / configurations for CVE-2020-3243

References for CVE-2020-3243