CVE-2019-20840 — An issue was discovered in LibVNCServer before 0
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.
Published
2020-06-17T15:11:10.000Z
Last modified
2024-08-05T02:53:09.404Z
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-06-17T15:11:10.000Z
- Last modified: 2024-08-05T02:53:09.404Z
09References
- github.com — https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServe…
- github.com — https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e328…
- lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html
- lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html
- usn.ubuntu.com — https://usn.ubuntu.com/4434-1/
- cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.
Read the API reference →