CVE-2013-4521: RichFaces implementation in Nuxeo Platform 5.6.0 before HF27 and 5.8.0 before HF-01 does not restrict the clas

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2013-4521 is a critical-severity flaw (CVSS 9.8) affecting nuxeo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RichFaces implementation in Nuxeo Platform 5.6.0 before HF27 and 5.8.0 before HF-01 does not restrict the classes for which deserialization methods can be called, which allows remote attackers to execute arbitrary code via crafted serialized data. NOTE: this vulnerability may overlap CVE-2013-2165.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-502
Published	2020-02-06
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: nuxeo

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-02-06 16:15 UTCPublished CVE record published
2026-06-16 23:57 UTCUpdated Record last modified

nuxeo nuxeo DOWNGRADE

Affected: 5.6.0 · 5.6.0 hotfix01 · 5.6.0 hotfix02 · 5.6.0 hotfix03 · 5.6.0 hotfix04 · 5.6.0 hotfix05 · 5.6.0 hotfix06 · 5.6.0 hotfix07

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.0

1. Check installed version

apt-cache policy nuxeo || rpm -q nuxeo || nuxeo --version

2. No fixed release: DOWNGRADE to a release before 5.6.0 (Debian / Ubuntu)

apt-cache madison nuxeo sudo apt install nuxeo=<VERSION_BEFORE_5.6.0> sudo apt-mark hold nuxeo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nuxeo sudo dnf downgrade nuxeo-<VERSION_BEFORE_5.6.0> sudo dnf versionlock add nuxeo

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2013-4521?

nuxeo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-4521 being exploited?

CVE-2013-4521 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2013-4521 affect?

CVE-2013-4521 affects nuxeo. Severity is critical (CVSS 9.8). RichFaces implementation in Nuxeo Platform 5.6.0 before HF27 and 5.8.0 before HF-01 does not restrict the classes for which deserialization methods can be called, which allows remote attackers to execute arbitrary code via crafted serialize

How urgent is CVE-2013-4521?

Priority 62/100. Critical severity; EPSS top 9%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-32828 MEDIUM 5.4 UPGRADE The Nuxeo Platform is an open source content management platform for building business applications

References

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