CVE-2025-28172: Grandstream Networks UCM6510 v1.0.20.52 and before is vulnerable to Improper Restriction of Excessive Authenti

Q: How do I fix CVE-2025-28172?

ucm6510 firmware: upgrade to newer than 1.0.20.52. Exact commands for each OS are on this page.

Q: Is CVE-2025-28172 being exploited?

CVE-2025-28172 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-2025-28172 affect?

CVE-2025-28172 affects ucm6510 firmware. Severity is medium (CVSS 6.5). Grandstream Networks UCM6510 v1.0.20.52 and before is vulnerable to Improper Restriction of Excessive Authentication Attempts. An attacker can perform an arbitrary number of authentication attempts using different passwords and eventually g

Q: How urgent is CVE-2025-28172?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2025-28172 is a medium-severity flaw (CVSS 6.5) affecting ucm6510 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Grandstream Networks UCM6510 v1.0.20.52 and before is vulnerable to Improper Restriction of Excessive Authentication Attempts. An attacker can perform an arbitrary number of authentication attempts using different passwords and eventually gain access to the targeted account using a brute force attack.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-307
Published	2025-07-29
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: grandstream

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

Am I affected?

Timeline

2025-07-29 15:15 UTCPublished CVE record published
2026-07-05 01:21 UTCUpdated Record last modified

grandstream ucm6510 firmware UPGRADE

Affected: <= 1.0.20.52

Fixed in: newer than 1.0.20.52

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-2025-28172?

ucm6510 firmware: upgrade to newer than 1.0.20.52. Exact commands for each OS are on this page.

Is CVE-2025-28172 being exploited?

CVE-2025-28172 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-2025-28172 affect?

CVE-2025-28172 affects ucm6510 firmware. Severity is medium (CVSS 6.5). Grandstream Networks UCM6510 v1.0.20.52 and before is vulnerable to Improper Restriction of Excessive Authentication Attempts. An attacker can perform an arbitrary number of authentication attempts using different passwords and eventually g

How urgent is CVE-2025-28172?

Priority 33/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-28171 MEDIUM 6.5 UPGRADE An issue in Grandstream UCM6510 v.1.0.20.52 and before allows a remote attacker to obtain sensitive informatio

References

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