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CVE-2026-67303

FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == BytesReturned)) in serial_process_irp_device_control() in channels/serial/client/serial_main.c. When serial device redirection is enabled and a server-controlled IRP_MJ_DEVICE_CONTROL request specifies an unsupported IOCTL with a non-zero OutputBufferLength, CommDeviceIoControl() can fail with BytesReturned = 0, causing the mismatch to trigger the assertion and abort the client process (denial of service).
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1da68195482033830b1710baeddd4742a1f63c0d6087008cdc1810dd5be216d5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"FreeRDP","vendor":"FreeRDP","versions":[{"lessThan":"3.29.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.29.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-617","description":"Reachable Assertion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/FreeRDP/FreeRDP/commit/1cc783d4c78bd2f66d3a8582dfe70a663d141444"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/references/1
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/references/2
{"name":"GitHub Security Advisory (GHSA-pfxq-3qmw-8vjx)","tags":["vendor-advisory"],"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pfxq-3qmw-8vjx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/references/0
{"name":"VulnCheck Advisory: FreeRDP before 3.29.0 Denial of Service via serial DeviceControl","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/freerdp-before-denial-of-service-via-serial-devicecontrol"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8bebc47779001e8962c39c9bd308f874862aa4af8a16a0318cd77d4220e37fa3 · sha256:e5fc6626a3e2d5d3… · /containers/cna/references/3

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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