CVE-2025-56752: A vulnerability in the Ruijie RG-ES series switch firmware ESW_1.0(1)B1P39 enables remote attackers to fully b

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CRITICAL 9.4REMOTEMITIGATEMITIGATEMITIGATE

CVE-2025-56752 is a critical-severity flaw (CVSS 9.4) affecting rg-es228gs-p firmware, rg-es209gc-p firmware, rg-es205gc-p firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the Ruijie RG-ES series switch firmware ESW_1.0(1)B1P39 enables remote attackers to fully bypass authentication mechanisms, providing them with unrestricted access to alter administrative settings and potentially seize control of affected devices via crafted HTTP POST request to /user.cgi.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.4 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-287
Published	2025-09-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ruijie

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

Am I affected?

Timeline

2025-09-03 18:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

ruijie rg-es228gs-p firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ruijie rg-es209gc-p firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ruijie rg-es205gc-p firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ruijie rg-es205gc firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ruijie rg-es208gc firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ruijie rg-es206gs-p firmware MITIGATE

Affected: esw_1.0\(1\)b1p27 · esw_1.0\(1\)b1p35 · esw_1.0\(1\)b1p39

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2025-56752?

rg-es228gs-p firmware: mitigate or apply the listed mitigation; rg-es209gc-p firmware: mitigate or apply the listed mitigation; rg-es205gc-p firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56752 being exploited?

CVE-2025-56752 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-2025-56752 affect?

CVE-2025-56752 affects rg-es228gs-p firmware, rg-es209gc-p firmware, rg-es205gc-p firmware. Severity is critical (CVSS 9.4). A vulnerability in the Ruijie RG-ES series switch firmware ESW_1.0(1)B1P39 enables remote attackers to fully bypass authentication mechanisms, providing them with unrestricted access to alter administrative settings and potentially seize co

How urgent is CVE-2025-56752?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

References

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