FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 3.32.2
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Client build has WinPR verbose assertions enabled (WITH_VERBOSE_WINPR_ASSERT=ON) Client uses the classic RemoteFX path Affected FreeRDP versions 3.17.0 through 3.32.1
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure12/25Specific setups only, reachable over the network without a login
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 69 if added to CISA KEV
- Would score about 64 if CISA's SSVC rates exploitation active
CVE-2026-121395 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects FreeRDP; fixed in 3.32.2.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 19/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Fix
- Fixed in 3.32.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
FreeRDP, a widely used open-source Remote Desktop Protocol client library, is affected when built with verbose WinPR assertions enabled. A malicious RDP server can send specially crafted graphics data that crashes the client application, causing a denial of service.
Read the original description
FreeRDP from 3.17.0 before 3.32.2 contains an assertion failure in the RemoteFX differential decoder when verbose WinPR assertions are enabled. A malicious RDP server can send a crafted RemoteFX tile with adjacent LL3 coefficients summing beyond signed 16-bit range to abort the client process.
What to do
Check whether your setup matches what the bug needs.
Client build has WinPR verbose assertions enabled (WITH_VERBOSE_WINPR_ASSERT=ON) Client uses the classic RemoteFX path Affected FreeRDP versions 3.17.0 through 3.32.1Upgrade to a fixed version: 3.32.2.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- FreeRDP FreeRDP
From 3.17.0 · fixed in 3.32.2
Evidence 2
- Advisory
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-121395
Is CVE-2026-121395 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A malicious RDP server can abort the FreeRDP client process while the client is connecting, causing a denial of service. The crash is in the RemoteFX decoder.Source: github.com, vulncheck.com
Which versions are affected by CVE-2026-121395?
FreeRDP: from 3.17.0 before 3.32.2.Source: cve.now feed data
Am I affected, and how do I check?
FreeRDP 3.17.0 through 3.32.1 is affected, but only builds with WinPR verbose assertions enabled (WITH_VERBOSE_WINPR_ASSERT=ON) and only when the client negotiates the classic RemoteFX path with a server. Check the FreeRDP version you run and whether that build option was set.Source: github.com, vulncheck.com
How do I fix CVE-2026-121395?
Upgrade FreeRDP to 3.32.2 or later, which contains the fix.Source: github.com, vulncheck.com