CVE-2026-23948: freerdp NULL Pointer Dereference
CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-23948DEBIAN-CVE-2026-23948
Published 09-02-2026Last modified 10-02-2026
Vulnerability summary
CVE-2026-23948 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in freerdp. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.7% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.53%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 18 · Related 3Timeline
- 09-02-2026PublishedVulnerability first disclosed.
- 10-02-2026Last modifiedVulnerability information updated.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.22.0, a NULL pointer dereference vulnerability in rdp_write_logon_info_v2() allows a malicious RDP server to crash FreeRDP proxy by sending a specially crafted LogonInfoV2 PDU with cbDomain=0 or cbUserName=0. This vulnerability is fixed in 3.22.0.
CVSS metrics
6 scores · 4 sources · 2 versionsMedium 6.9Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
High 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.53%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
+0.04 pp
From 0.48% on 20-09-2026
20-09-202620-10-2026
EPSS score0.53%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu3 products
- freerdpAll versions (No fix recorded)
- freerdp2< 2.2.0+dfsg1-0ubuntu0.18.04.4+esm5 | < 2.6.1+dfsg1-0ubuntu0.20.04.2+esm3 | < 2.6.1+dfsg1-3ubuntu2.10 | < 2.11.5+dfsg1-1ubuntu0.1~esm5
- freerdp3< 3.5.1+dfsg1-0ubuntu1.2 | < 3.16.0+dfsg-2ubuntu0.1
Debian2 products
- freerdp2All versions (No fix recorded)
- freerdp3< 3.15.0+dfsg-2.1+deb13u1 | < 3.22.0+dfsg-1
Freerdp1 product
- freerdp< 3.22.0
3 vendors · 6 products
References
6 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6f3c-qvqq-2px5X Refsource CONFIRMREPORTPatchVendor Advisory
- github.com/FreeRDP/FreeRDP/commit/4d44e3c097656a8b9ec696353647b0888ca45860X Refsource MISCREPORTPatch
