CVE-2025-1695: In NGINX Unit before version 1.34.2 with the Java Language Module in use, undisclosed requests can lead to an

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MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2025-1695 is a medium-severity flaw (CVSS 5.3) affecting nginx unit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In NGINX Unit before version 1.34.2 with the Java Language Module in use, undisclosed requests can lead to an infinite loop and cause an increase in CPU resource utilization. This vulnerability allows a remote attacker to cause a degradation that can lead to a limited denial-of-service (DoS). There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not e

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-835
Published	2025-03-04
Last modified	2026-06-17

Publisher (CNA): F5 Networks · Vendor: f5

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

Am I affected?

Timeline

2025-03-04 01:15 UTCPublished CVE record published
2026-06-17 08:39 UTCUpdated Record last modified

f5 nginx unit UPGRADE

Affected: >= 1.29.1 and < 1.34.2

Fixed in: 1.34.2

Safe to downgrade to: a release before 1.29.1

1. Check installed version

apt-cache policy nginx-unit || rpm -q nginx-unit || nginx-unit --version

2. UPGRADE to 1.34.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nginx-unit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nginx-unit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.29.1 (Debian / Ubuntu)

apt-cache madison nginx-unit sudo apt install nginx-unit=<VERSION_BEFORE_1.29.1> sudo apt-mark hold nginx-unit

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nginx-unit sudo dnf downgrade nginx-unit-<VERSION_BEFORE_1.29.1> sudo dnf versionlock add nginx-unit

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-2025-1695?

nginx unit: upgrade to 1.34.2. Exact commands for each OS are on this page.

Is CVE-2025-1695 being exploited?

CVE-2025-1695 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-2025-1695 affect?

CVE-2025-1695 affects nginx unit. Severity is medium (CVSS 5.3). In NGINX Unit before version 1.34.2 with the Java Language Module in use, undisclosed requests can lead to an infinite loop and cause an increase in CPU resource utilization. This vulnerability allows a remote attacker to cause a degradati

How urgent is CVE-2025-1695?

Priority 41/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

nginx vulnerabilities · Java vulnerabilities · F5 BIG-IP vulnerabilities

References

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