CVE-2021-4201 | Pre-authentication session hijacking

Missing access control in ForgeRock Access Management 7.1.0 and earlier versions on all platforms allows remote unauthenticated attackers to hijack sessions, including potentially admin-level sessions. This issue affects: ForgeRock Access Management 7.1 versions prior to 7.1.1; 6.5 versions prior to 6.5.4; all previous versions.

Published: 2022-02-14 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-4201 is rated High Risk (66.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.95%). EPSS rose +1.03% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2021-4201

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 2026-06-15 0.91% 1.95% +1.03%
2 2025-03-30 2.17% 0.91% -1.26%
3 2025-03-29 — 2.17% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-4201

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.6 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.
 2.8 6.0 [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]
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]

Weakness enumeration for CVE-2021-4201

Affected software / configurations for CVE-2021-4201

Vendor Product Version Raw CPE
forgerock access_management 5.5.2 cpe:2.3:a:forgerock:access_management:5.5.2:*:*:*:*:*:*:*
forgerock access_management 6.0.0 cpe:2.3:a:forgerock:access_management:6.0.0:*:*:*:*:*:*:*
forgerock access_management 6.0.0.1 cpe:2.3:a:forgerock:access_management:6.0.0.1:*:*:*:*:*:*:*
forgerock access_management 6.0.0.2 cpe:2.3:a:forgerock:access_management:6.0.0.2:*:*:*:*:*:*:*
forgerock access_management 6.0.0.3 cpe:2.3:a:forgerock:access_management:6.0.0.3:*:*:*:*:*:*:*
forgerock access_management 6.0.0.4 cpe:2.3:a:forgerock:access_management:6.0.0.4:*:*:*:*:*:*:*
forgerock access_management 6.0.0.6 cpe:2.3:a:forgerock:access_management:6.0.0.6:*:*:*:*:*:*:*
forgerock access_management 6.0.0.7 cpe:2.3:a:forgerock:access_management:6.0.0.7:*:*:*:*:*:*:*
forgerock access_management 6.5.0 cpe:2.3:a:forgerock:access_management:6.5.0:*:*:*:*:*:*:*
forgerock access_management 6.5.0.1 cpe:2.3:a:forgerock:access_management:6.5.0.1:*:*:*:*:*:*:*
forgerock access_management 6.5.0.2 cpe:2.3:a:forgerock:access_management:6.5.0.2:*:*:*:*:*:*:*
forgerock access_management 6.5.1 cpe:2.3:a:forgerock:access_management:6.5.1:*:*:*:*:*:*:*
forgerock access_management 6.5.2.1 cpe:2.3:a:forgerock:access_management:6.5.2.1:*:*:*:*:*:*:*
forgerock access_management 6.5.2.2 cpe:2.3:a:forgerock:access_management:6.5.2.2:*:*:*:*:*:*:*
forgerock access_management 6.5.2.3 cpe:2.3:a:forgerock:access_management:6.5.2.3:*:*:*:*:*:*:*
forgerock access_management 6.5.3 cpe:2.3:a:forgerock:access_management:6.5.3:*:*:*:*:*:*:*
forgerock access_management 7.0.0 cpe:2.3:a:forgerock:access_management:7.0.0:*:*:*:*:*:*:*
forgerock access_management 7.0.1 cpe:2.3:a:forgerock:access_management:7.0.1:*:*:*:*:*:*:*
forgerock access_management 7.0.2 cpe:2.3:a:forgerock:access_management:7.0.2:*:*:*:*:*:*:*
forgerock access_management 7.1.0 cpe:2.3:a:forgerock:access_management:7.1.0:*:*:*:*:*:*:*

References for CVE-2021-4201

cvelogic Threat Intelligence