# CVE-2021-35464 — Forgerock Access Management

**CISA KEV** · **Ransomware**

> As of 2025-10-21, CVE-2021-35464 is a CRITICAL-severity vulnerability in Forgerock Access Management, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), with a US federal remediation deadline of 2021-11-17, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2021-35464, most recently “Scattered Spider (G1015): RMM-Based Persistence and Social-Engineering Intrusion Tradecraft”.

**Last updated:** 2025-10-21

## What is 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

The record classifies CVE-2021-35464 under weakness class [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1927 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- **CISA KEV:** Listed since 2021-11-03, federal remediation deadline 2021-11-17 — used in known ransomware campaigns
- **Threadlinqs priority:** 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- **Published:** 2021-07-22, last modified 2025-10-21

## Is CVE-2021-35464 being exploited?

CISA added CVE-2021-35464 to the Known Exploited Vulnerabilities catalog on 2021-11-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2021-11-17 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2021-35464 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2021/CVE-2021-35464.yaml`). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

- [Y4er/openam-CVE-2021-35464](https://github.com/Y4er/openam-CVE-2021-35464) (github)
- [rood8008/CVE-2021-35464](https://github.com/rood8008/CVE-2021-35464) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2021/CVE-2021-35464.md) (trickest)

## Affected products and versions

- **Forgerock**: Access Management, Openam

## How to fix CVE-2021-35464

Vendor advisory: [https://backstage.forgerock.com/knowledge/kb/article/a47894244](https://backstage.forgerock.com/knowledge/kb/article/a47894244). Because CVE-2021-35464 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2021-11-17. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2021-35464

1 tracked threat in the Threadlinqs corpus references CVE-2021-35464, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Scattered Spider (G1015): RMM-Based Persistence and Social-Engineering Intrusion Tradecraft](https://intel.threadlinqs.com/threat/TL-2026-1333) — HIGH · 2026-07-14

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [backstage.forgerock.com](https://backstage.forgerock.com/knowledge/kb/article/a47894244)

**Other references**

- [bugster.forgerock.org](https://bugster.forgerock.org/)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/163486/ForgeRock-OpenAM-Jato-Java-Deserialization.html)
- [packetstormsecurity.com (ForgeRock Access Manager OpenAM 14.6.3 R)](http://packetstormsecurity.com/files/163525/ForgeRock-Access-Manager-OpenAM-14.6.3-Remote-Code-Execution.html)

Canonical: https://intel.threadlinqs.com/cve/CVE-2021-35464
Full detection coverage and IOCs for threats exploiting CVE-2021-35464 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp