CVE-2025-43960: Adminer 4.8.1, when using Monolog for logging, allows a Denial of Service (memory consumption) via a crafted s

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HIGH 8.6REMOTEDOWNGRADE

CVE-2025-43960 is a high-severity flaw (CVSS 8.6) affecting adminer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Adminer 4.8.1, when using Monolog for logging, allows a Denial of Service (memory consumption) via a crafted serialized payload (e.g., using s:1000000000), leading to a PHP Object Injection issue. Remote, unauthenticated attackers can trigger this by sending a malicious serialized object, which forces excessive memory usage, rendering Adminer’s interface unresponsive and causing a server-level DoS. While the server may recover after several minut

Why this priority

High 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	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-502
Published	2025-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: adminer

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

Am I affected?

Timeline

2025-08-25 14:15 UTCPublished CVE record published
2026-06-17 09:24 UTCUpdated Record last modified

adminer adminer DOWNGRADE

Affected: 4.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.8.1

1. Check installed version

apt-cache policy adminer || rpm -q adminer || adminer --version

2. No fixed release: DOWNGRADE to a release before 4.8.1 (Debian / Ubuntu)

apt-cache madison adminer sudo apt install adminer=<VERSION_BEFORE_4.8.1> sudo apt-mark hold adminer

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list adminer sudo dnf downgrade adminer-<VERSION_BEFORE_4.8.1> sudo dnf versionlock add adminer

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-43960?

adminer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-43960 being exploited?

CVE-2025-43960 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-2025-43960 affect?

CVE-2025-43960 affects adminer. Severity is high (CVSS 8.6). Adminer 4.8.1, when using Monolog for logging, allows a Denial of Service (memory consumption) via a crafted serialized payload (e.g., using s:1000000000), leading to a PHP Object Injection issue. Remote, unauthenticated attackers can trigg

How urgent is CVE-2025-43960?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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