Vulnerability-Lookup

CNVD-2026-16033

Vulnerability from cnvd - Published: 2026-04-03

Title

FreeRDP堆缓冲区溢出漏洞（CNVD-2026-16033）

Description

FreeRDP是一款开源的远程桌面协议（RDP）实现库与客户端。 FreeRDP存在堆缓冲区溢出漏洞。该漏洞产生的原因是persistent cache中bmpSize同步错误导致堆内存写入越界。攻击者可利用该漏洞通过构造恶意RDP数据触发堆溢出。

Severity

中

Patch Name

FreeRDP堆缓冲区溢出漏洞（CNVD-2026-16033）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存在堆缓冲区溢出漏洞。该漏洞产生的原因是persistent cache中bmpSize同步错误导致堆内存写入越界。攻击者可利用该漏洞通过构造恶意RDP数据触发堆溢出。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-ff8h-p5vc-wcwc

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-33987

Impacted products

Name
FreeRDP FreeRDP <=3.24.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-33987",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-33987"
    }
  },
  "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\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fpersistent cache\u4e2dbmpSize\u540c\u6b65\u9519\u8bef\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u6076\u610fRDP\u6570\u636e\u89e6\u53d1\u5806\u6ea2\u51fa\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-ff8h-p5vc-wcwc",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-16033",
  "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\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u4ea7\u751f\u7684\u539f\u56e0\u662fpersistent cache\u4e2dbmpSize\u540c\u6b65\u9519\u8bef\u5bfc\u81f4\u5806\u5185\u5b58\u5199\u5165\u8d8a\u754c\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u6784\u9020\u6076\u610fRDP\u6570\u636e\u89e6\u53d1\u5806\u6ea2\u51fa\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\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-16033\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "FreeRDP FreeRDP \u003c=3.24.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-33987",
  "serverity": "\u4e2d",
  "submitTime": "2026-04-02",
  "title": "FreeRDP\u5806\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-16033\uff09"
}

CVE-2026-33987 (GCVE-0-2026-33987)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-03-31 15:32

Title

FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-31 15:32 UTC

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/1a890eb…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33987",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T15:32:34.486052Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-31T15:32:44.898Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "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, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent-\u003ebmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122: Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-131",
              "description": "CWE-131: Incorrect Calculation of Buffer Size",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-30T21:43:39.943Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ff8h-p5vc-wcwc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ff8h-p5vc-wcwc"
        },
        {
          "name": "https://github.com/FreeRDP/FreeRDP/commit/1a890eb43492b5eb707cb3dd6fc908f696e8fc1c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/FreeRDP/FreeRDP/commit/1a890eb43492b5eb707cb3dd6fc908f696e8fc1c"
        }
      ],
      "source": {
        "advisory": "GHSA-ff8h-p5vc-wcwc",
        "discovery": "UNKNOWN"
      },
      "title": "FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33987",
    "datePublished": "2026-03-30T21:43:39.943Z",
    "dateReserved": "2026-03-24T22:20:06.211Z",
    "dateUpdated": "2026-03-31T15:32:44.898Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CNVD-2026-16033

CVE-2026-33987 (GCVE-0-2026-33987)

Tags

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Nomenclature

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