CVE-2023-40567: debian debian_linux Out-of-bounds Write
Vulnerability summary
CVE-2023-40567 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 1.50% chance of exploitation in the next 30 days, higher than 73.9% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 8 · Related 4Timeline
- 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. Affected versions are subject to an Out-Of-Bounds Write in the `clear_decompress_bands_data` function in which there is no offset validation. Abuse of this vulnerability may lead to an out of bounds write. 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.orgCNA6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LDiffers
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.50%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
0.00 pp
From 1.50% 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+esm1 | < 2.2.0+dfsg1-0ubuntu0.20.04.5 | < 2.6.1+dfsg1-3ubuntu2.4
4 vendors · 5 products
References
13 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2w9f-8wg4-8jfpX Refsource CONFIRMREPORTExploitVendor Advisory
- github.com/FreeRDP/FreeRDP/blob/5be5553e0da72178a4b94cc1ffbdace9ceb153e5/libfreerdp/codec/clear.cX Refsource MISCREPORTIssue Tracking
- github.com/FreeRDP/FreeRDP/blob/5be5553e0da72178a4b94cc1ffbdace9ceb153e5/libfreerdp/codec/clear.cX Refsource MISCREPORTIssue Tracking
- lists.fedoraproject.org/archives/…Mailing List
- lists.fedoraproject.org/archives/…Mailing List
- lists.fedoraproject.org/archives/…Mailing List
