How severe is CVE-2025-29843?

CVE-2025-29843 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-29843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-29843?

CVE-2025-29843 primarily affects Synology Router Manager. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-29843?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-29843 have an EU (EUVD) identifier?

Yes. CVE-2025-29843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201176.

When was CVE-2025-29843 published?

CVE-2025-29843 was published on 2025-12-04 and last updated on 2026-06-17.

CVE-2025-29843

CVE-2025-29843 is a medium-severity vulnerability in Synology Router Manager with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201176
Weakness: CWE-22
Affected product: Synology Router Manager
Published: 2025-12-04
Last modified: 2026-06-17

Description

A vulnerability in FileStation thumb cgi allows remote authenticated users to read/write image files.

Frequently asked questions

What is CVE-2025-29843?: A vulnerability in FileStation thumb cgi allows remote authenticated users to read/write image files.
How severe is CVE-2025-29843?: CVE-2025-29843 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-29843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-29843?: CVE-2025-29843 primarily affects Synology Router Manager. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-29843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-29843 have an EU (EUVD) identifier?: Yes. CVE-2025-29843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201176.
When was CVE-2025-29843 published?: CVE-2025-29843 was published on 2025-12-04 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_25_04

Affected products (14)

cpe:2.3:o:synology:router_manager:*:*:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:-:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update1:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update10:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update11:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update12:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update2:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update3:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update4:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update5:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update6:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update7:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update8:*:*:*:*:*:*
cpe:2.3:o:synology:router_manager:1.3.1-9346:update9:*:*:*:*:*:*

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