CVE-2019-20840 An issue was discovered in LibVNCServer before 0.9.13.
High 7.5
Published
Updated
Check this codebase for CVE-2019-20840 and fix it if it is affected.
What it is: CVE-2019-20840 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020.
Exploitation: There is no known exploitation of CVE-2019-20840 in the wild and no public exploit code.
Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2019-20840/ (Markdown: https://insights.sbomify.com/CVE-2019-20840/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2019-20840?
CVE-2019-20840 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2019-20840?
It affects 10 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver, Opensuse Leap, Siemens Simatic Itc1500 Firmware, Siemens Simatic Itc1500 Pro Firmware and 4 more.
How do I fix CVE-2019-20840?
Upgrade to a fixed version.
Is CVE-2019-20840 being exploited?
There is no known exploitation of CVE-2019-20840 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2019-20840, GHSA-42fc-843w-r7rp, UBUNTU-CVE-2019-20840.