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CVE-2026-33977

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fb50a5e41dad4479e4a06b28b5757c8de0856f3abd096a9da25e55af7d35ad0a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"FreeRDP","vendor":"FreeRDP","versions":[{"status":"affected","version":"< 3.24.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-617","description":"CWE-617: Reachable Assertion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47","tags":["x_refsource_MISC"],"url":"https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/cna/references/1
{"name":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f69a1b186fa6c72249c36efb26fa8f90f02d472398b301859d1192db05ad6bc9 · sha256:ec38c78280c0f5b7… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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