Vulnerability-Lookup

CNVD-2026-16035

Vulnerability from cnvd - Published: 2026-04-03

Title

FreeRDP拒绝服务漏洞（CNVD-2026-16035）

Description

FreeRDP是一款开源的远程桌面协议（RDP）实现库与客户端。 FreeRDP存在拒绝服务漏洞。该漏洞产生的原因是IMA ADPCM音频解码过程中未对step index参数进行有效校验，导致越界访问查找表并触发断言失败。攻击者可利用该漏洞通过构造恶意RDP服务器音频数据使客户端进程崩溃。

Severity

高

Patch Name

FreeRDP拒绝服务漏洞（CNVD-2026-16035）的补丁

Patch Description

FreeRDP是一款开源的远程桌面协议（RDP）实现库与客户端。 FreeRDP存在拒绝服务漏洞。该漏洞产生的原因是IMA ADPCM音频解码过程中未对step index参数进行有效校验，导致越界访问查找表并触发断言失败。攻击者可利用该漏洞通过构造恶意RDP服务器音频数据使客户端进程崩溃。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-33977

Impacted products

Name
FreeRDP FreeRDP <3.24.2

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-33977",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-33977"
    }
  },
  "description": "FreeRDP\u662f\u4e00\u6b3e\u5f00\u6e90\u7684\u8fdc\u7a0b\u684c\u9762\u534f\u8bae\uff08RDP\uff09\u5b9e\u73b0\u5e93\u4e0e\u5ba2\u6237\u7aef\u3002\n\nFreeRDP\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fIMA ADPCM\u97f3\u9891\u89e3\u7801\u8fc7\u7a0b\u4e2d\u672a\u5bf9step index\u53c2\u6570\u8fdb\u884c\u6709\u6548\u6821\u9a8c\uff0c\u5bfc\u81f4\u8d8a\u754c\u8bbf\u95ee\u67e5\u627e\u8868\u5e76\u89e6\u53d1\u65ad\u8a00\u5931\u8d25\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u6076\u610fRDP\u670d\u52a1\u5668\u97f3\u9891\u6570\u636e\u4f7f\u5ba2\u6237\u7aef\u8fdb\u7a0b\u5d29\u6e83\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-16035",
  "openTime": "2026-04-03",
  "patchDescription": "FreeRDP\u662f\u4e00\u6b3e\u5f00\u6e90\u7684\u8fdc\u7a0b\u684c\u9762\u534f\u8bae\uff08RDP\uff09\u5b9e\u73b0\u5e93\u4e0e\u5ba2\u6237\u7aef\u3002\r\n\r\nFreeRDP\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fIMA ADPCM\u97f3\u9891\u89e3\u7801\u8fc7\u7a0b\u4e2d\u672a\u5bf9step index\u53c2\u6570\u8fdb\u884c\u6709\u6548\u6821\u9a8c\uff0c\u5bfc\u81f4\u8d8a\u754c\u8bbf\u95ee\u67e5\u627e\u8868\u5e76\u89e6\u53d1\u65ad\u8a00\u5931\u8d25\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u6076\u610fRDP\u670d\u52a1\u5668\u97f3\u9891\u6570\u636e\u4f7f\u5ba2\u6237\u7aef\u8fdb\u7a0b\u5d29\u6e83\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "FreeRDP\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2026-16035\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "FreeRDP FreeRDP \u003c3.24.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-33977",
  "serverity": "\u9ad8",
  "submitTime": "2026-04-02",
  "title": "FreeRDP\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2026-16035\uff09"
}

CVE-2026-33977 (GCVE-0-2026-33977)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:41 – Updated: 2026-03-31 19:09

Title

FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

Summary

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 default configuration. This issue has been patched in version 3.24.2.

Severity ?

6.9 (Medium)


                        
                          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

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/9be3f03…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33977",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T18:38:45.941200Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-31T19:09:29.001Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "FreeRDP",
          "vendor": "FreeRDP",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.24.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 (\u003e= 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 default configuration. This issue has been patched in version 3.24.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-617",
              "description": "CWE-617: Reachable Assertion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-30T21:41:36.853Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "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"
        },
        {
          "name": "https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47"
        }
      ],
      "source": {
        "advisory": "GHSA-8f2g-3q27-6xm5",
        "discovery": "UNKNOWN"
      },
      "title": "FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33977",
    "datePublished": "2026-03-30T21:41:36.853Z",
    "dateReserved": "2026-03-24T22:20:06.210Z",
    "dateUpdated": "2026-03-31T19:09:29.001Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CNVD-2026-16035

CVE-2026-33977 (GCVE-0-2026-33977)

Tags

Sightings

Nomenclature