CVE-2019-25601
CVE-2019-25601 is a medium-severity vulnerability with a CVSS 3.x base score of 6.2. 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-787.
Key facts
- Severity: Medium (CVSS 3.x base score 6.2)
- CVSS v4: 6.9
- EPSS exploit prediction: 0% (18th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2019-19944
- Weakness: CWE-787
- Published:
- Last modified:
Description
UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path vncviewer.exe property field that allows local attackers to crash the application by supplying an excessively long string. Attackers can input a 300-byte payload of repeated characters through the Properties dialog to trigger a denial of service condition.
Frequently asked questions
- What is CVE-2019-25601?
- UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path vncviewer.exe property field that allows local attackers to crash the application by supplying an excessively long string. Attackers can input a 300-byte payload of repeated characters through the Properties dialog to trigger a denial of service condition.
- How severe is CVE-2019-25601?
- CVE-2019-25601 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2019-25601 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2019-25601?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2019-25601 have an EU (EUVD) identifier?
- Yes. CVE-2019-25601 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19944.
- When was CVE-2019-25601 published?
- CVE-2019-25601 was published on 2026-03-22 and last updated on 2026-06-17.
References
- https://www.exploit-db.com/exploits/46703
- https://www.uvnc.com/
- https://www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html
- https://www.vulncheck.com/advisories/ultravnc-launcher-denial-of-service-buffer-overflow
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