CVE-2021-35049: Vulnerability in Fidelis Network and Deception CommandPost enables authenticated command injection through the

Q: How do I fix CVE-2021-35049?

deception: upgrade to 9.3.7; network: upgrade to 9.3.7. Exact commands for each OS are on this page.

Q: Is CVE-2021-35049 being exploited?

CVE-2021-35049 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-35049 affect?

CVE-2021-35049 affects deception, network. Severity is critical (CVSS 9.9). Vulnerability in Fidelis Network and Deception CommandPost enables authenticated command injection through the web interface. The vulnerability could allow a specially crafted HTTP request to execute system commands on the CommandPost and r

Q: How urgent is CVE-2021-35049?

Priority 63/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference

This week

CRITICAL 9.9UPGRADEUPGRADE

CVE-2021-35049 is a critical-severity flaw (CVSS 9.9) affecting deception, network. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in Fidelis Network and Deception CommandPost enables authenticated command injection through the web interface. The vulnerability could allow a specially crafted HTTP request to execute system commands on the CommandPost and return results in an HTTP response in an authenticated session. The vulnerability is present in Fidelis Network and Deception versions prior to 9.3.7 and in version 9.4. Patches and updates are available to addr

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-89, CWE-78
Published	2021-06-25
Last modified	2026-06-17

Publisher (CNA): Fidelis Cybersecurity, Inc. · Vendor: fidelissecurity

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

Am I affected?

Timeline

2021-06-25 12:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

fidelissecurity deception UPGRADE

Affected: < 9.3.7 · 9.4

Fixed in: 9.3.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.3.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade deception

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade deception

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fidelissecurity network UPGRADE

Affected: < 9.3.7 · 9.4

Fixed in: 9.3.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.3.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade network

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade network

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-35049?

deception: upgrade to 9.3.7; network: upgrade to 9.3.7. Exact commands for each OS are on this page.

Is CVE-2021-35049 being exploited?

CVE-2021-35049 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-2021-35049 affect?

CVE-2021-35049 affects deception, network. Severity is critical (CVSS 9.9). Vulnerability in Fidelis Network and Deception CommandPost enables authenticated command injection through the web interface. The vulnerability could allow a specially crafted HTTP request to execute system commands on the CommandPost and r

How urgent is CVE-2021-35049?

Priority 63/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference

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References

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