CVE-2019-15693 — tigervnc: Heap buffer overflow in TightDecoder::FilterGradient

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HIGH

tigervnc: Heap buffer overflow in TightDecoder::FilterGradient

Published Dec 26, 2019

7.2

HIGH

CVSS 3.1

EPSS 4.28%

Description

TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which occurs in TightDecoder::FilterGradient. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.

Affected products

Vendor Kaspersky Product TigerVNC Default
n/a
- Version
  1.10.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Kaspersky

TigerVNC

n/a

Version	Status	Constraints
1.10.0	affected	-

Red Hat Enterprise Linux 7

tigervnc-0:1.8.0-21.el7

Fixed · RHSA-2020:3875
Red Hat Enterprise Linux 8

tigervnc-0:1.9.0-14.el8_1

Fixed · RHSA-2020:1497
Red Hat Enterprise Linux 6

tigervnc

Out of support scope

Product	Package	State	Advisory
Red Hat Enterprise Linux 7	tigervnc-0:1.8.0-21.el7	Fixed	RHSA-2020:3875
Red Hat Enterprise Linux 8	tigervnc-0:1.9.0-14.el8_1	Fixed	RHSA-2020:1497
Red Hat Enterprise Linux 6	tigervnc	Out of support scope	n/a

Remediation

No remediation recorded yet.

Metrics

4.28% 0.04277

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.04277

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (16 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	4.28% (0.04277)	90.79th	v5 (v2026.06.15)
Jun 15, 2026	4.28% (0.04277)	89.79th	v5 (v2026.06.15)
Mar 30, 2025	8.47% (0.08470)	91.53th	v4 (v2025.03.14)
Mar 29, 2025	23.41% (0.23413)	93.50th	v4 (v2025.03.14)
Mar 17, 2025	8.47% (0.08470)	91.72th	v4 (v2025.03.14)
Dec 12, 2024	0.36% (0.00360)	73.09th	v3 (v2023.03.01)
Feb 8, 2024	0.36% (0.00360)	71.42th	v3 (v2023.03.01)
May 8, 2023	0.36% (0.00360)	67.99th	v3 (v2023.03.01)
Mar 7, 2023	0.46% (0.00465)	71.62th	v3 (v2023.03.01)
Mar 6, 2023	4.57% (0.04571)	88.92th	v2 (v2022.01.01)
Apr 1, 2022	4.57% (0.04571)	87.83th	v2 (v2022.01.01)
Feb 4, 2022	52.14% (0.52138)	98.35th	v2 (v2022.01.01)
Feb 3, 2022	9.47% (0.09469)	87.07th	v1
Jan 6, 2022	9.47% (0.09469)	86.91th	v1
Sep 1, 2021	2.28% (0.02278)	78.03th	v1
Apr 14, 2021	2.28% (0.02278)	0.00th	v1

Weaknesses (2)

CWE-122

CWE-787

Out-of-bounds Write

References (8)

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html
vendor-advisoryx_refsource_SUSEBroken Link
https://access.redhat.com/security/cve/CVE-2019-15693
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1790313
Issue Tracking
https://github.com/CendioOssman/tigervnc/commit/b4ada8d0c6dac98c8b91fc64d112569a8ae5fb95
x_refsource_MISCPatchThird Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1
x_refsource_MISCRelease NotesThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-15693
https://www.cve.org/CVERecord?id=CVE-2019-15693
https://www.openwall.com/lists/oss-security/2019/12/20/2
mailing-listx_refsource_MLISTExploitMailing ListThird Party Advisory

Link	Providers	Tags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html		vendor-advisoryx_refsource_SUSEBroken Link
https://access.redhat.com/security/cve/CVE-2019-15693		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1790313		Issue Tracking
https://github.com/CendioOssman/tigervnc/commit/b4ada8d0c6dac98c8b91fc64d112569a8ae5fb95		x_refsource_MISCPatchThird Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1		x_refsource_MISCRelease NotesThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-15693
https://www.cve.org/CVERecord?id=CVE-2019-15693
https://www.openwall.com/lists/oss-security/2019/12/20/2		mailing-listx_refsource_MLISTExploitMailing ListThird Party Advisory