8.1

CVE-2020-26117: debian debian_linux Improper Certificate Validation

CVSS: 8.1v3.1HighModified
AliasesMGASA-2020-0388SUSE-SU-2020:2880-1SUSE-SU-2020:2881-1
Published 27-09-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-26117 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in debian debian_linux. EPSS estimates a 3.06% chance of exploitation in the next 30 days, higher than 87.4% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
3.06%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2024:10591-1

Timeline

  1. 27-09-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

3.06%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 3.06% on 20-09-2026

20-09-202620-10-2026
EPSS score
3.06%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse25 products
  • tigervnc&distro=HPE Helion OpenStack 8< 1.6.0-27.1
  • tigervnc&distro=SUSE Enterprise Storage 5< 1.6.0-27.1
  • tigervnc&distro=SUSE Linux Enterprise High Performance Computing 15-ESPOS< 1.8.0-13.14.1
  • tigervnc&distro=SUSE Linux Enterprise High Performance Computing 15-LTSS< 1.8.0-13.14.1
  • tigervnc&distro=SUSE Linux Enterprise Module for Basesystem 15 SP1< 1.9.0-19.9.1
Redhat12 products
  • tigervnc< 0:1.11.0-6.el8
  • tigervnc-debuginfo< 0:1.11.0-6.el8
  • tigervnc-debugsource< 0:1.11.0-6.el8
  • tigervnc-icons< 0:1.11.0-6.el8
  • tigervnc-license< 0:1.11.0-6.el8
Opensuse3 products
  • leapEOL15.2
  • tigervnc&distro=openSUSE Leap 15.1< 1.9.0-lp151.4.9.1
  • tigervnc&distro=openSUSE Leap 15.2< 1.9.0-lp152.7.3.1
Debian2 products
  • tigervnc< 1.10.1+dfsg-9 | < 1.7.0+dfsg-7+deb9u2
  • debian_linuxEOL9.0
Mageia1 product
  • tigervnc< 1.10.1-1.2.mga7
Tigervnc1 product
Ubuntu1 product
  • tigervncAll versions (No fix recorded) | < 1.10.1+dfsg-3ubuntu0.1+esm2

7 vendors · 45 products

References

39 links
Show all 39 references