CVE-2020-35442: FDCMS (also known as Fangfa Content Management System) 4.0 allows remote attackers to get a webshell in the ba

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-35442 is a critical-severity flaw (CVSS 9.8) affecting fdcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FDCMS (also known as Fangfa Content Management System) 4.0 allows remote attackers to get a webshell in the background via Front/lib/Action/FindexAction.class.php.

Why this priority

Critical severity
Public exploit reference
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	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-06-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fangfa

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-02 22:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

fangfa fdcms DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison fdcms sudo apt install fdcms=<VERSION_BEFORE_4.0> sudo apt-mark hold fdcms

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

dnf --showduplicates list fdcms sudo dnf downgrade fdcms-<VERSION_BEFORE_4.0> sudo dnf versionlock add fdcms

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-2020-35442?

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

Is CVE-2020-35442 being exploited?

CVE-2020-35442 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-2020-35442 affect?

CVE-2020-35442 affects fdcms. Severity is critical (CVSS 9.8). FDCMS (also known as Fangfa Content Management System) 4.0 allows remote attackers to get a webshell in the background via Front/lib/Action/FindexAction.class.php.

How urgent is CVE-2020-35442?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-35441 CRITICAL 9.8 DOWNGRADE FDCMS (aka Fangfa Content Management System) 4.0 contains a front-end SQL injection via Admin/Lib/Action/Flogi
CVE-2018-17048 HIGH 7.5 DOWNGRADE admin/Lib/Action/FpluginAction.class.php in FDCMS (aka Fangfa Content Manage System) 4.2 allows SQL Injection.

References

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