CVE-2023-4537: Comarch ERP XL client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead t

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HIGH 7.4REMOTEUPGRADE

CVE-2023-4537 is a high-severity flaw (CVSS 7.4) affecting erp xl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Comarch ERP XL client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affects ERP XL: from 2020.2.2 through 2023.2.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-755
Published	2024-02-15
Last modified	2026-06-17

Publisher (CNA): CERT.PL · Vendor: comarch

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

Am I affected?

Timeline

2024-02-15 09:15 UTCPublished CVE record published
2026-06-17 06:38 UTCUpdated Record last modified

comarch erp xl UPGRADE

Affected: >= 2020.2.2 and <= 2023.2

Fixed in: newer than 2023.2

Safe to downgrade to: a release before 2020.2.2

1. Check installed version

apt-cache policy erp-xl || rpm -q erp-xl || erp-xl --version

2. UPGRADE to newer than 2023.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade erp-xl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade erp-xl

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 2020.2.2 (Debian / Ubuntu)

apt-cache madison erp-xl sudo apt install erp-xl=<VERSION_BEFORE_2020.2.2> sudo apt-mark hold erp-xl

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

dnf --showduplicates list erp-xl sudo dnf downgrade erp-xl-<VERSION_BEFORE_2020.2.2> sudo dnf versionlock add erp-xl

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-2023-4537?

erp xl: upgrade to newer than 2023.2. Exact commands for each OS are on this page.

Is CVE-2023-4537 being exploited?

CVE-2023-4537 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-2023-4537 affect?

CVE-2023-4537 affects erp xl. Severity is high (CVSS 7.4). Comarch ERP XL client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affects ERP XL: from 2020.2.2 through

How urgent is CVE-2023-4537?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-4539 HIGH 7.5 UPGRADE Use of a hard-coded password for a special database account created during Comarch ERP XL installation allows
CVE-2023-4538 MEDIUM 6.2 UPGRADE The database access credentials configured during installation are stored in a special table, and are encrypte

References

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