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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "matchCriteriaId": "E6899265-905F-4A3A-96D3-07B552FBFBEC", "versionEndExcluding": "3.21.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the FreeRDP client\u2019s `gdi_SurfaceToSurface` path due to a mismatch between destination rectangle clamping and the actual copy size. A malicious server can trigger a client\u2011side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code\u2011execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue."}], "id": "CVE-2026-23532", "lastModified": "2026-01-28T18:48:28.807", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-01-19T17:15:51.040", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/gdi/gfx.c#L1368-L1382"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fq8c-87hj-7gvr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "freerdp: FreeRDP: Denial of Service and potential code execution via client-side heap buffer overflow", "id": "2430891", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430891"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["A flaw was found in FreeRDP. A malicious server can exploit a client-side heap buffer overflow vulnerability in the `gdi_SurfaceToSurface` path. This vulnerability, caused by a mismatch in memory handling, can lead to a crash (Denial of Service) of the client application. Furthermore, it carries a risk of heap corruption, which could potentially enable arbitrary code execution on the affected system."], "name": "CVE-2026-23532", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-19T17:03:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23532\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23532\nhttps://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/gdi/gfx.c#L1368-L1382\nhttps://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fq8c-87hj-7gvr"], "statement": "For this vulnerability to be exploited, a client must connect to a maliciously-configured server. Red Hat recommends that FreeRDP clients are only used to connect to trusted servers.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T15:53:07.383569+00:00", "value": {"mitigation_remediation": ["Apply FreeRDP 3.21.0 or later to fix the heap-buffer-overflow in gdi_SurfaceToSurface.", "If an upgrade cannot occur immediately, restrict incoming RDP connections to trusted hosts and monitor the client for abnormal crashes or memory usage patterns.", "Deploy an intermediate firewall or proxy that filters RDP traffic, allowing only known, authenticated servers and blocking attempts to send malformed paint operations that could trigger the overflow."], "summary": {"action": "Patch Immediately", "impact": "Potential Remote Code Execution"}, "threat_synthesis": {"affected_systems": "All FreeRDP clients prior to version 3.21.0 are affected. The issue manifests in the free implementation of the Remote Desktop Protocol provided by the vendor FreeRDP.", "description_and_impact": "A heap-buffer-overflow occurs in the FreeRDP client\u2019s gdi_SurfaceToSurface path when the destination rectangle clamping does not match the actual copy size. A malicious RDP server can send crafted data that triggers an overflow on the client side, leading to a crash that provides denial\u2011of\u2011service. Depending on the memory allocator and surrounding heap layout, the overflow may also result in heap corruption and the opportunity to execute arbitrary code on the client. The weakness is classified as CWE\u2011122.", "risk_and_exploitability": "The CVSS score of 7.7 rates the vulnerability as high severity. The EPSS score is below 1 %, indicating that, at the time of assessment, exploitation is thought to be rare. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires a connection to a malicious RDP server and relies on the client performing an unsafe memory copy. If an attacker can control heap layout, the risk of remote code execution rises, whereas in typical deployments the primary risk is denial of service."}}}}, "created": "2026-01-20T08:40:53.794515+00:00", "updated": "2026-04-18T16:00:04.287092+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}