CVE-2023-28725: General Bytes Crypto Application Server (CAS) 20230120, as distributed with General Bytes BATM devices, allows

This week

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2023-28725 is a critical-severity flaw (CVSS 9.1) affecting crypto application server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

General Bytes Crypto Application Server (CAS) 20230120, as distributed with General Bytes BATM devices, allows remote attackers to execute arbitrary Java code by uploading a Java application to the /batm/app/admin/standalone/deployments directory, aka BATM-4780, as exploited in the wild in March 2023. This is fixed in 20221118.48 and 20230120.44.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
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	20.6% (top 2%)
CISA exploited list	No
Weakness	CWE-434
Published	2023-03-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: generalbytes

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

Am I affected?

Timeline

2023-03-22 00:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

generalbytes crypto application server DOWNGRADE

Affected: 20230120

Fixed in: no fixed release known

Safe to downgrade to: a release before 20230120

1. Check installed version

apt-cache policy crypto-application-server || rpm -q crypto-application-server || crypto-application-server --version

2. No fixed release: DOWNGRADE to a release before 20230120 (Debian / Ubuntu)

apt-cache madison crypto-application-server sudo apt install crypto-application-server=<VERSION_BEFORE_20230120> sudo apt-mark hold crypto-application-server

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

dnf --showduplicates list crypto-application-server sudo dnf downgrade crypto-application-server-<VERSION_BEFORE_20230120> sudo dnf versionlock add crypto-application-server

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-2023-28725?

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

Is CVE-2023-28725 being exploited?

CVE-2023-28725 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-2023-28725 affect?

CVE-2023-28725 affects crypto application server. Severity is critical (CVSS 9.1). General Bytes Crypto Application Server (CAS) 20230120, as distributed with General Bytes BATM devices, allows remote attackers to execute arbitrary Java code by uploading a Java application to the /batm/app/admin/standalone/deployments dir

How urgent is CVE-2023-28725?

Priority 66/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

References

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