CVE-2019-15680
TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to be exploitable via network connectivity.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.67% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- tightvnc/tightvnc
- Source
- vulnerability@kaspersky.com
EPSS 2.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf
- https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-08
- https://usn.ubuntu.com/4407-1/
- https://www.openwall.com/lists/oss-security/2018/12/10/5Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf
- https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-08
- https://usn.ubuntu.com/4407-1/
- https://www.openwall.com/lists/oss-security/2018/12/10/5Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.