CVE-2023-39356: debian debian_linux Out-of-bounds Read
Vulnerability summary
CVE-2023-39356 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 1.81% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 31-08-2023PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a missing offset validation may lead to an Out Of Bound Read in the function `gdi_multi_opaque_rect`. In particular there is no code to validate if the value `multi_opaque_rect->numRectangles` is less than 45. Looping through `multi_opaque_rect->`numRectangles without proper boundary checks can lead to Out-of-Bounds Read errors which will likely lead to a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.
CVSS metrics
4 scores · 4 sources · 1 version- CVE.orgCNA5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
1.81%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.81% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundFreerdp
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian2 products
- freerdp2< 2.11.7+dfsg1-6~deb12u1
- debian_linuxEOL10.0
Fedoraproject1 product
- fedoraEOL37 | 38 | 39
Freerdp1 product
- freerdp≥ 3.0.0-beta1, < 3.0.0-beta3 | < 2.11.0 | 3.0.0:beta1 | 3.0.0:beta2
Ubuntu1 product
- freerdp2< 2.2.0+dfsg1-0ubuntu0.18.04.4+esm2 | < 2.2.0+dfsg1-0ubuntu0.20.04.6 | < 2.6.1+dfsg1-3ubuntu2.5
4 vendors · 5 products
References
15 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q5v5-qhj5-mh6mX Refsource CONFIRMREPORTExploitVendor Advisory
- github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/include/freerdp/primary.hX Refsource MISCREPORTIssue Tracking
- github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/core/orders.cX Refsource MISCREPORTIssue Tracking
- github.com/FreeRDP/FreeRDP/blob/63a2f65618748c12f79ff7450d46c6e194f2db76/libfreerdp/gdi/gdi.cX Refsource MISCREPORTIssue Tracking
- lists.fedoraproject.org/archives/…Mailing List
- lists.fedoraproject.org/archives/…Mailing List
- lists.fedoraproject.org/archives/…Mailing List
- security.gentoo.org/glsa/202401-16Third Party Advisory