CVE-2018-20748: canonical ubuntu_linux Out-of-bounds Write
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2018-20748DEBIAN-CVE-2018-20748
Published 30-01-2019Last modified 05-08-2024
Vulnerability summary
CVE-2018-20748 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 3.26% chance of exploitation in the next 30 days, higher than 88.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
3.26%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 11 · Related 8Timeline
- 30-01-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
CVSS metrics
4 scores · 3 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
3.26%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
0.00 pp
From 3.26% on 18-09-2026
18-09-202618-10-2026
EPSS score3.26%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (openwall.com)
Maturity: unknown
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
Debian3 products
- libvncserver< 0.9.11+dfsg-1.3
- veyon< 4.1.7+repack1-1
- debian_linuxEOL8.0
Ubuntu3 products
- italc< 1:2.0.2+dfsg1-4ubuntu0.1 | < 1:3.0.3+dfsg1-3ubuntu0.1
- libvncserver< 0.9.9+dfsg-1ubuntu1.4 | < 0.9.10+dfsg-3ubuntu0.16.04.3 | < 0.9.11+dfsg-1ubuntu1.1
- tightvnc< 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | All versions (No fix recorded)
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Libvnc_project1 product
- libvncserver< 0.9.12
5 vendors · 14 products
References
18 links
lists.debian.org/debian-lts-announce/2019/01/msg00029.htmlMailing ListX Refsource MLISTThird Party Advisory- github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42baeX Refsource MISCPatchThird Party Advisory
- github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2cX Refsource MISCPatchThird Party Advisory
- github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2aX Refsource MISCPatchThird Party Advisory
- github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7X Refsource MISCPatchThird Party Advisory
- www.openwall.com/lists/oss-security/2018/12/10/8X Refsource MISCExploitMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2019/10/msg00042.htmlMailing ListX Refsource MLISTThird Party Advisory