CVE-2019-20840: canonical ubuntu_linux Out-of-bounds Write
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2019-20840DEBIAN-CVE-2019-20840
Published 17-06-2020Last modified 05-08-2024
Vulnerability summary
CVE-2019-20840 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 2.61% chance of exploitation in the next 30 days, higher than 85.1% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
2.61%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 17-06-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.61%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
0.00 pp
From 2.61% on 18-09-2026
18-09-202618-10-2026
EPSS score2.61%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Siemens6 products
- simatic_itc1500_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1500_pro_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1900_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc1900_pro_firmware≥ 3.0.0.0, < 3.2.1.0
- simatic_itc2200_firmware≥ 3.0.0.0, < 3.2.1.0
Ubuntu3 products
- libvncserver< 0.9.10+dfsg-3ubuntu0.16.04.5 | < 0.9.11+dfsg-1ubuntu1.3
- veyonAll versions (No fix recorded)
- x11vncAll versions (No fix recorded)
Debian2 products
- libvncserver< 0.9.13+dfsg-1
- debian_linuxEOL8.0 | 9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10 | 20.04
Libvnc_project1 product
- libvncserver≤ 0.9.12
Opensuse1 product
- leapEOL15.2
6 vendors · 14 products
References
12 links- github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13X Refsource MISCREPORTRelease NotesThird Party Advisory
- github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76X Refsource MISCPatchThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
