CVE-2023-4967 [High] | Memory Corruption in Netscaler Application Del…

CVE-2023-4967 is rated Moderate Risk (57/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.57%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-19	0.44%	0.57%	+0.13%
2	2025-09-20	0.45%	0.44%	-0.01%
3	2025-09-16	—	0.45%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-19

0.44%

0.57%

+0.13%

2025-09-20

0.45%

0.44%

-0.01%

2025-09-16

—

0.45%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.2	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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: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:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	4.2	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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: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: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.	3.9	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.2

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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: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:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

4.2

[email protected]

7.5

3.1

HIGH

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

3.9

3.6

[email protected]

Affected software / configurations for CVE-2023-4967

Vendor	Product	Version	Raw CPE
citrix	netscaler_application_delivery_controller	>= 13.0, < 13.0-92.19	cpe:2.3:a:citrix:netscaler_application_delivery_controller::::::::
citrix	netscaler_application_delivery_controller	>= 13.1, < 13.1-49.15	cpe:2.3:a:citrix:netscaler_application_delivery_controller::::::::
citrix	netscaler_application_delivery_controller	>= 14.1, < 14.1-8.50	cpe:2.3:a:citrix:netscaler_application_delivery_controller::::::::
citrix	netscaler_gateway	>= 13.0, < 13.0-92.19	cpe:2.3:a:citrix:netscaler_gateway::::::::
citrix	netscaler_gateway	>= 13.1, < 13.1-49.15	cpe:2.3:a:citrix:netscaler_gateway::::::::
citrix	netscaler_gateway	>= 14.1, < 14.1-8.50	cpe:2.3:a:citrix:netscaler_gateway::::::::
citrix	netscaler_application_delivery_controller	>= 12.1, <= 12.1-55.300	cpe:2.3:a:citrix:netscaler_application_delivery_controller:::::fips:::*
citrix	netscaler_application_delivery_controller	>= 12.1, <= 12.1-55.300	cpe:2.3:a:citrix:netscaler_application_delivery_controller:::::ndcpp:::*
citrix	netscaler_application_delivery_controller	>= 13.1, <= 13.1-37.164	cpe:2.3:a:citrix:netscaler_application_delivery_controller:::::fips:::*

References for CVE-2023-4967

URL	Tags
https://support.citrix.com/article/CTX579459/	Vendor Advisory

URL

CVE-2023-4967 | Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2023-4967

Common vulnerability scoring system (CVSS) metrics for CVE-2023-4967

Weakness enumeration for CVE-2023-4967

Affected software / configurations for CVE-2023-4967

References for CVE-2023-4967