What is CVE-2021-35464?

CVE-2021-35464 is a critical-severity vulnerability in Forgerock Access Management, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-07-22.

How severe is CVE-2021-35464?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-35464 known to be exploited?

Yes. CVE-2021-35464 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 33 public proof-of-concept repositories are indexed.

Deserialization in Forgerock Access Management

CVE-2021-35464

ForgeRock AM server before 7.0 has a Java deserialization vulnerability in the jato.pageSession parameter on multiple pages. The exploitation does not require authentication, and remote code execution can be triggered by sending a single crafted /ccversion/* request to the server. The vulnerability exists due to the usage of Sun ONE Application Framework (JATO) found in versions of Java 8 or earlier

Vulnerability class: Insecure Deserialization

Published 2021-07-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 1.000 (100.0th percentile), scored 2026-09-12.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

bugster.forgerock.org (Broken Link)
packetstormsecurity.com/files/163486/ForgeRock-OpenAM-Jato-Java-Deserialization… (Exploit, VDB Entry, Third Party Advisory)
packetstormsecurity.com/files/163525/ForgeRock-Access-Manager-OpenAM-14.6.3-Rem… (Exploit, VDB Entry, Third Party Advisory)
backstage.forgerock.com/knowledge/kb/article/a47894244 (Vendor Advisory, Permissions Required, Exploit)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-35464?: CVE-2021-35464 is a critical-severity vulnerability in Forgerock Access Management, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-07-22.
How severe is CVE-2021-35464?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-35464 known to be exploited?: Yes. CVE-2021-35464 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 33 public proof-of-concept repositories are indexed.