CVE-2025-22940: Incorrect access control in Adtran 411 ONT L80.00.0011.M2 allows unauthorized attackers to arbitrarily set the

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CRITICAL 9.1REMOTEMITIGATE

CVE-2025-22940 is a critical-severity flaw (CVSS 9.1) affecting 411 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect access control in Adtran 411 ONT L80.00.0011.M2 allows unauthorized attackers to arbitrarily set the admin password.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-03-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: adtran

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

Am I affected?

Timeline

2025-03-31 15:15 UTCPublished CVE record published
2026-06-17 08:51 UTCUpdated Record last modified

adtran 411 firmware MITIGATE

Affected: l80.00.0011.m2

Fixed in: no fixed release known

Safe to downgrade to: a release before l80.00.0011.m2

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-2025-22940?

411 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-22940 being exploited?

CVE-2025-22940 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-2025-22940 affect?

CVE-2025-22940 affects 411 firmware. Severity is critical (CVSS 9.1). Incorrect access control in Adtran 411 ONT L80.00.0011.M2 allows unauthorized attackers to arbitrarily set the admin password.

How urgent is CVE-2025-22940?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-22941 CRITICAL 9.8 MITIGATE A command injection vulnerability in the web interface of Adtran 411 ONT L80.00.0011.M2 allows attackers to es
CVE-2025-22939 CRITICAL 9.8 MITIGATE A command injection vulnerability in the telnet service of Adtran 411 ONT L80.00.0011.M2 allows attackers to e
CVE-2025-22938 CRITICAL 9.8 MITIGATE Adtran 411 ONT L80.00.0011.M2 was discovered to contain weak default passwords.
CVE-2025-22937 CRITICAL 9.8 MITIGATE An issue in Adtran 411 ONT vL80.00.0011.M2 allows attackers to escalate privileges via unspecified vectors.

References

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