CVE-2025-2848: A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive

Q: How do I fix CVE-2025-2848?

mail server: upgrade to 1.7.6-10676, 1.7.6-20676. Exact commands for each OS are on this page.

Q: Is CVE-2025-2848 being exploited?

CVE-2025-2848 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-2848 affect?

CVE-2025-2848 affects mail server. Severity is medium (CVSS 6.3). A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive settings, and disable some non-critical functions.

Q: How urgent is CVE-2025-2848?

Priority 30/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2025-2848 is a medium-severity flaw (CVSS 6.3) affecting mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive settings, and disable some non-critical functions.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-862
Published	2025-12-04
Last modified	2026-09-25

Publisher (CNA): Synology Inc. · Vendor: synology

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-04 15:15 UTCPublished CVE record published
2026-09-25 23:10 UTCUpdated Record last modified

synology mail server UPGRADE

Affected: < 1.7.6-10676 · < 1.7.6-20676

Fixed in: 1.7.6-10676, 1.7.6-20676

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mail-server || rpm -q mail-server || mail-server --version

2. UPGRADE to 1.7.6-10676 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mail-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mail-server

Note

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

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-2025-2848?

mail server: upgrade to 1.7.6-10676, 1.7.6-20676. Exact commands for each OS are on this page.

Is CVE-2025-2848 being exploited?

CVE-2025-2848 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-2025-2848 affect?

CVE-2025-2848 affects mail server. Severity is medium (CVSS 6.3). A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive settings, and disable some non-critical functions.

How urgent is CVE-2025-2848?

Priority 30/100. No elevated risk signals yet.

Software pages

Synology vulnerabilities

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References

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