CVE-2023-38120: Adtran SR400ac ping Command Injection Remote Code Execution Vulnerability

This month

HIGH 8.8MITIGATE

CVE-2023-38120 is a high-severity flaw (CVSS 8.8) affecting sr400ac firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Adtran SR400ac ping Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Adtran SR400ac routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the ping command, which is available over JSON-RPC. A crafted host parameter can trigger execution

Why this priority

High severity
EPSS top 10%: very likely to be exploited

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Weakness	CWE-78, CWE-77
Published	2024-05-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: adtran

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

Am I affected?

Timeline

2024-05-03 02:15 UTCPublished CVE record published
2026-06-17 06:09 UTCUpdated Record last modified

adtran sr400ac firmware MITIGATE

Affected: 10.8.5.1 · 10.8.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.8.5.1

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-2023-38120?

sr400ac firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-38120 being exploited?

CVE-2023-38120 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-2023-38120 affect?

CVE-2023-38120 affects sr400ac firmware. Severity is high (CVSS 8.8). Adtran SR400ac ping Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Adtran SR400ac routers. Although authentication is required to expl

How urgent is CVE-2023-38120?

Priority 53/100. High severity; EPSS top 10%: very likely to be exploited

References

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