CVE-2020-14346
An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.63% probability · 50th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- x.org/x server · canonical/ubuntu linux · redhat/enterprise linux
- Source
- secalert@redhat.com
EPSS 0.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1862246Issue Tracking, Third Party Advisory
- https://lists.x.org/archives/xorg-announce/2020-August/003058.htmlMailing List, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202012-01Third Party Advisory
- https://usn.ubuntu.com/4488-2/Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1417/Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1862246Issue Tracking, Third Party Advisory
- https://lists.x.org/archives/xorg-announce/2020-August/003058.htmlMailing List, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202012-01Third Party Advisory
- https://usn.ubuntu.com/4488-2/Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1417/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.