CVE-2026-33977— FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)
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I. Basic Information for CVE-2026-33977
Vulnerability Information
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Vulnerability Title
FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
可达断言
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.24.2之前版本存在安全漏洞，该漏洞源于恶意RDP服务器发送具有无效初始步进索引值的IMA ADPCM格式音频数据，触发断言失败和进程中止，可能导致启用音频重定向的FreeRDP客户端崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33977
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Same Patch Batch · FreeRDP · 2026-03-30 · 9 CVEs total
| CVE-2026-33986 | 7.5 HIGH | FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write |
| CVE-2026-33984 | 7.5 HIGH | FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write |
| CVE-2026-33982 | 7.1 HIGH | FreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read |
| CVE-2026-33987 | 7.1 HIGH | FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write |
| CVE-2026-33983 | 6.5 MEDIUM | FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS |
| CVE-2026-33985 | 5.9 MEDIUM | FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read |
| CVE-2026-33995 | 5.3 MEDIUM | FreeRDP: Possible double free in kerberos_AcceptSecurityContext |
| CVE-2026-33952 | FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks |
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same weakness: CWE-617
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V. Comments for CVE-2026-33977
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