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Fencer Vulns
high 7.5

CVE-2019-15680 json

TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS).

published 2019-10-29 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-6619

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • tightvnc Debian 14, Debian 13, Debian 12 1:1.3.9-9.1

debian advisories DEBIAN-CVE-2019-15680

  • libvncserver Ubuntu 16.04 LTS 0.9.10+dfsg-3ubuntu0.16.04.4
  • libvncserver Ubuntu 18.04 LTS 0.9.11+dfsg-1ubuntu1.2
  • libvncserver Ubuntu 20.04 LTS 0.9.12+dfsg-9ubuntu0.1
  • tightvnc Ubuntu Pro 14.04 LTS 1.3.9-6.5+deb8u1build0.14.04.1~esm1

ubuntu advisories UBUNTU-CVE-2019-15680

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tightvnc SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 1.3.9-81.15.3.1

suse advisories SUSE-SU-2019:14235-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-343-08 updated cvss 7.5

Siemens Products using TightVNC (Update A)

  • Siemens SIMATIC HMI Comfort Outdoor Panels 7" & 15" (incl. SIPLUS variants) Siemens SIMATIC HMI Comfort Panels 4" - 22" (incl. SIPLUS variants) Siemens SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F Siemens SIMATIC ITC1500 V3.1 Siemens SIMATIC ITC1500 V3.1 PRO Siemens SIMATIC ITC1900 V3.1
    +5 more products
    Siemens SIMATIC ITC1900 V3.1 PRO Siemens SIMATIC ITC2200 V3.1 Siemens SIMATIC ITC2200 V3.1 PRO Siemens SIMATIC WinCC Runtime Advanced Siemens SIMATIC WinCC Runtime Professional
    affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Kaspersky TightVNC

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.