CVE-2021-35370: An issue found in Peacexie Imcat v5.4 allows attackers to execute arbitrary code via the incomplete filtering

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-35370 is a critical-severity flaw (CVSS 9.8) affecting imcat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue found in Peacexie Imcat v5.4 allows attackers to execute arbitrary code via the incomplete filtering function.

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	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-20
Published	2023-02-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: txjia

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

Am I affected?

Timeline

2023-02-24 16:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

txjia imcat DOWNGRADE

Affected: 5.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.4 (Debian / Ubuntu)

apt-cache madison imcat sudo apt install imcat=<VERSION_BEFORE_5.4> sudo apt-mark hold imcat

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

dnf --showduplicates list imcat sudo dnf downgrade imcat-<VERSION_BEFORE_5.4> sudo dnf versionlock add imcat

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-2021-35370?

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

Is CVE-2021-35370 being exploited?

CVE-2021-35370 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-2021-35370 affect?

CVE-2021-35370 affects imcat. Severity is critical (CVSS 9.8). An issue found in Peacexie Imcat v5.4 allows attackers to execute arbitrary code via the incomplete filtering function.

How urgent is CVE-2021-35370?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-36444 HIGH 8.8 DOWNGRADE Cross Site Request Forgery (CSRF) vulnerability in imcat 5.4 allows remote attackers to gain escalated privile
CVE-2021-36443 HIGH 8.8 DOWNGRADE Cross Site Request Forgery vulnerability in imcat 5.4 allows remote attackers to escalate privilege via lack o
CVE-2021-35369 MEDIUM 6.5 DOWNGRADE Arbitrary File Read vulnerability found in Peacexie ImCat v.5.2 fixed in v.5.4 allows attackers to obtain sens

References

← Back to latest CVEs