CVE-2026-34805: Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /

Q: How do I fix CVE-2026-34805?

firewall community: upgrade to newer than 3.3.25. Exact commands for each OS are on this page.

Q: Is CVE-2026-34805 being exploited?

CVE-2026-34805 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-2026-34805 affect?

CVE-2026-34805 affects firewall community. Severity is medium (CVSS 6.4). Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/dnat.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the

Q: How urgent is CVE-2026-34805?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.4UPGRADE

CVE-2026-34805 is a medium-severity flaw (CVSS 6.4) affecting firewall community. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/dnat.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: endian

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 15:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

endian firewall community UPGRADE

Affected: <= 3.3.25

Fixed in: newer than 3.3.25

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firewall-community || rpm -q firewall-community || firewall-community --version

2. UPGRADE to newer than 3.3.25 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firewall-community

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firewall-community

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-2026-34805?

firewall community: upgrade to newer than 3.3.25. Exact commands for each OS are on this page.

Is CVE-2026-34805 being exploited?

CVE-2026-34805 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-2026-34805 affect?

CVE-2026-34805 affects firewall community. Severity is medium (CVSS 6.4). Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/dnat.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the

How urgent is CVE-2026-34805?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34790 HIGH 7.1 UPGRADE Endian Firewall version 3.3.25 and prior allow authenticated users to delete arbitrary files via directory tra
CVE-2026-34791 HIGH 8.8 UPGRADE Endian Firewall version 3.3.25 and prior allow authenticated users to execute arbitrary OS commands via the DA
CVE-2026-34795 HIGH 8.8 UPGRADE Endian Firewall version 3.3.25 and prior allow authenticated users to execute arbitrary OS commands via the DA
CVE-2026-34796 HIGH 8.8 UPGRADE Endian Firewall version 3.3.25 and prior allow authenticated users to execute arbitrary OS commands via the DA
CVE-2026-34792 HIGH 8.8 UPGRADE Endian Firewall version 3.3.25 and prior allow authenticated users to execute arbitrary OS commands via the DA

References

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