How severe is CVE-2025-66834?

CVE-2025-66834 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-66834 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66834?

CVE-2025-66834 affects Trueconf Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66834?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66834 have an EU (EUVD) identifier?

Yes. CVE-2025-66834 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205839.

When was CVE-2025-66834 published?

CVE-2025-66834 was published on 2025-12-30 and last updated on 2026-06-17.

CVE-2025-66834

CVE-2025-66834 is a high-severity vulnerability in Trueconf Server with a CVSS 3.x base score of 7.3. 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-1236.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205839
Weakness: CWE-1236
Affected product: Trueconf Server
Published: 2025-12-30
Last modified: 2026-06-17

Description

A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal user to inject malicious spreadsheet formulas into exported chat logs via crafted Display Name.

Frequently asked questions

What is CVE-2025-66834?: A CSV Formula Injection vulnerability in TrueConf Server v5.5.2.10813 allows a normal user to inject malicious spreadsheet formulas into exported chat logs via crafted Display Name.
How severe is CVE-2025-66834?: CVE-2025-66834 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-66834 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66834?: CVE-2025-66834 affects Trueconf Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66834?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66834 have an EU (EUVD) identifier?: Yes. CVE-2025-66834 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205839.
When was CVE-2025-66834 published?: CVE-2025-66834 was published on 2025-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trueconf:server:5.5.2.10813:*:*:*:*:*:*:*

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