CVE-2022-27518 | Unauthenticated remote arbitrary code execution

Exp

Unauthenticated remote arbitrary code execution

Published: 2022-12-13 Last update: 2026-02-25 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-27518 is rated Critical Active Threat (100/100): CVSS Critical severity, with high exploitation likelihood (EPSS 27.69%, 96th percentile). CISA KEV confirms active exploitation (added 2022-12-13) affecting Citrix / Application Delivery Controller (ADC) and Gateway. a weakness (CWE-664) Unauthenticated remote administrative access may be possible. EPSS rose +2.53% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2022-27518

Name: Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass Vulnerability · CISA KEV detail

Exploit added: 2022-12-13

Action due: 2023-01-03

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2022-27518

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-22 25.16% 27.69% +2.53%
2 2026-03-21 22.96% 25.16% +2.20%
3 2025-12-21 — 22.96% —

Full EPSS history (43 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-27518

CVSS metrics for this CVE.

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 3.1 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]

Weakness enumeration for CVE-2022-27518

Affected software / configurations for CVE-2022-27518

Vendor Product Version Raw CPE
citrix application_delivery_controller_firmware >= 12.1, < 12.1-55.291 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:fips:*:*:*
citrix application_delivery_controller_firmware >= 12.1, < 12.1-55.291 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:ndcpp:*:*:*
citrix application_delivery_controller_firmware >= 12.1, < 12.1-65.25 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix application_delivery_controller_firmware >= 13.0, < 13.0-58.32 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix gateway_firmware >= 12.1, < 12.1-65.25 cpe:2.3:o:citrix:gateway_firmware:*:*:*:*:*:*:*:*
citrix gateway_firmware >= 13.0, < 13.0-58.32 cpe:2.3:o:citrix:gateway_firmware:*:*:*:*:*:*:*:*

References for CVE-2022-27518

cvelogic Threat Intelligence