CVE-2022-27518
CriticalExploitedPublic exploitUnauthenticated remote arbitrary code execution
Published Jul 12, 2023 · Updated Oct 21, 2025 · Also known as TR-22-0736, TR-23-0399
Key Facts
Patch immediately- CVE-2022-27518 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Application Delivery Controller Firmware (Citrix), Gateway Firmware (Citrix), Citrix Gateway, Citrix ADC.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 13, 2022. Public exploit code is available.
- EPSS estimates a 6.9% probability of exploitation in the next 30 days.
- Fixed versions are available, including Application Delivery Controller Firmware 12.1-55.291, Application Delivery Controller Firmware 12.1-65.25, Gateway Firmware 12.1-65.25.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
6.9%
Higher than 93.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-27518 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Unauthenticated remote arbitrary code execution
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 13, 2022 | Jan 3, 2023 | Not reported |
| Industry KEV feed | Dec 13, 2022 | Jan 3, 2023 | Not reported |
| CIRCL KEV | Dec 13, 2022 | Jan 3, 2023 | Not reported |
| ENISA EUVD | Dec 13, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Application Delivery Controller FirmwareCitrix | See advisory | 12.1-65.25 |
| Gateway FirmwareCitrix | See advisory | 12.1-65.25 |
| Citrix Gateway, Citrix ADC | >= 12.1 | n/a |
Patched Releases
Application Delivery Controller Firmware
12.1-55.291, 12.1-65.25
Gateway Firmware
12.1-65.25
Timeline
Added to CISA KEV
Dec 13, 2022
Added to Industry KEV feed
Dec 13, 2022
Added to CIRCL KEV
Dec 13, 2022
Added to ENISA EUVD
Dec 13, 2022
Publicly disclosed
Jul 12, 2023
Last updated
Oct 21, 2025
Weakness Type
- CWE-664 Improper Control of a Resource Through its Lifetime
References
- advisoryhttps://sensorstechforum.com/cve-2022-27505-citrix/
- advisoryhttps://sensorstechforum.com/cve-2022-27518-citrix-zero-day/
- advisoryhttps://support.citrix.com/article/CTX474995
- advisoryhttps://support.citrix.com/article/CTX561480/citrix-secure-access-client-for-windows-security-bulletin-for-cve202324491
- advisoryhttps://support.citrix.com/article/CTX564169/citrix-secure-access-client-for-ubuntu-security-bulletin-for-cve202324492
FAQ
Common Questions.
Unauthenticated remote arbitrary code execution
Affected: Application Delivery Controller Firmware (Citrix); Gateway Firmware (Citrix); Citrix Gateway, Citrix ADC versions >= 12.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 13, 2022.
Yes. It was added on Dec 13, 2022 with a federal remediation due date of Jan 3, 2023.
Public exploit code is available.
Fixed versions are available, including Application Delivery Controller Firmware 12.1-55.291, Application Delivery Controller Firmware 12.1-65.25, Gateway Firmware 12.1-65.25.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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