CVE-2025-66848: JD Cloud NAS routers AX1800 (4.3.1.r4308 and earlier), AX3000 (4.3.1.r4318 and earlier), AX6600 (4.5.1.r4533 a

Q: How do I fix CVE-2025-66848?

ax1800 firmware: upgrade to newer than 4.3.1.r4308; ax3000 firmware: upgrade to newer than 4.3.1.r4318; ax6600 firmware: upgrade to newer than 4.5.1.r4533. Exact commands for each OS are on this page.

Q: Is CVE-2025-66848 being exploited?

CVE-2025-66848 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-2025-66848 affect?

CVE-2025-66848 affects ax1800 firmware, ax3000 firmware, ax6600 firmware. Severity is critical (CVSS 9.8). JD Cloud NAS routers AX1800 (4.3.1.r4308 and earlier), AX3000 (4.3.1.r4318 and earlier), AX6600 (4.5.1.r4533 and earlier), BE6500 (4.4.1.r4308 and earlier), ER1 (4.5.1.r4518 and earlier), and ER2 (4.5.1.r4518 and earlier) contain an unautho

Q: How urgent is CVE-2025-66848?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2025-66848 is a critical-severity flaw (CVSS 9.8) affecting ax1800 firmware, ax3000 firmware, ax6600 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JD Cloud NAS routers AX1800 (4.3.1.r4308 and earlier), AX3000 (4.3.1.r4318 and earlier), AX6600 (4.5.1.r4533 and earlier), BE6500 (4.4.1.r4308 and earlier), ER1 (4.5.1.r4518 and earlier), and ER2 (4.5.1.r4518 and earlier) contain an unauthorized remote command execution vulnerability.

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-94
Published	2025-12-30
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: jdcloud

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-30 17:15 UTCPublished CVE record published
2026-07-05 02:17 UTCUpdated Record last modified

jdcloud ax1800 firmware UPGRADE

Affected: <= 4.3.1.r4308

Fixed in: newer than 4.3.1.r4308

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.

jdcloud ax3000 firmware UPGRADE

Affected: <= 4.3.1.r4318

Fixed in: newer than 4.3.1.r4318

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.

jdcloud ax6600 firmware UPGRADE

Affected: <= 4.5.1.r4533

Fixed in: newer than 4.5.1.r4533

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.

jdcloud be6500 firmware UPGRADE

Affected: <= 4.4.1.r4308

Fixed in: newer than 4.4.1.r4308

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.

jdcloud er1 firmware UPGRADE

Affected: <= 4.5.1.r4518

Fixed in: newer than 4.5.1.r4518

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.

jdcloud er2 firmware UPGRADE

Affected: <= 4.5.1.r4518

Fixed in: newer than 4.5.1.r4518

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.

Exact fixes by distribution

Fedora ELN · openldap · FIXED · 2.6.16-1.eln159 · FEDORA-2026-4b30c86326 · source

sudo dnf upgrade --advisory=FEDORA-2026-4b30c86326

Fedora 46 · php-pecl-yac · FIXED · 3.0.1-2.fc46 · FEDORA-2026-5f43289aa2 · source

sudo dnf upgrade --advisory=FEDORA-2026-5f43289aa2

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-2025-66848?

ax1800 firmware: upgrade to newer than 4.3.1.r4308; ax3000 firmware: upgrade to newer than 4.3.1.r4318; ax6600 firmware: upgrade to newer than 4.5.1.r4533. Exact commands for each OS are on this page.

Is CVE-2025-66848 being exploited?

CVE-2025-66848 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-2025-66848 affect?

CVE-2025-66848 affects ax1800 firmware, ax3000 firmware, ax6600 firmware. Severity is critical (CVSS 9.8). JD Cloud NAS routers AX1800 (4.3.1.r4308 and earlier), AX3000 (4.3.1.r4318 and earlier), AX6600 (4.5.1.r4533 and earlier), BE6500 (4.4.1.r4308 and earlier), ER1 (4.5.1.r4518 and earlier), and ER2 (4.5.1.r4518 and earlier) contain an unautho

How urgent is CVE-2025-66848?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-67091 MEDIUM 6.5 MITIGATE An issue in GL Inet GL.Inet AX1800 Version 4.6.4 & 4.6.8 are vulnerable
CVE-2025-67090 MEDIUM 5.1 MITIGATE The LuCI web interface on Gl Inet GL.Inet AX1800 Version 4.6.4 & 4.6.8 are vulnerable
CVE-2024-45263 HIGH 8.8 MITIGATE UPGRADE An issue was discovered on certain GL-iNet devices, including MT6000, MT3000, MT2500, AXT1800, and AX1800 4.6.
CVE-2024-45262 HIGH 8.8 UPGRADE UPGRADE An issue was discovered on certain GL-iNet devices, including MT6000, MT3000, MT2500, AXT1800, and AX1800 4.6.
CVE-2024-45261 HIGH 8.0 UPGRADE UPGRADE An issue was discovered on certain GL-iNet devices, including MT6000, MT3000, MT2500, AXT1800, and AX1800 4.6.

References

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