CVE-2026-33983 — Integer Overflow or Wraparound in Freerdp

CWE-190 — Integer Overflow or WraparoundCWE-252 — Unchecked Return Value7 documents7 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 85.13%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Freerdp
Timeline
PublishedMar 30

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages2 packages

▶CVEListV5freerdp/freerdp< 3.24.2
▶NVDfreerdp/freerdp< 3.24.2

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

2
CVEList
FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS↗2026-03-30
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OSV
CVE-2026-33983: FreeRDP is a free implementation of the Remote Desktop Protocol↗2026-03-30
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📋Vendor Advisories

2
Red Hat
FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages↗2026-03-30
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Debian
CVE-2026-33983: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-33983 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

1
Bugzilla
CVE-2026-33983 FreeRDP: FreeRDP: Denial of Service via specially crafted Remote Desktop Protocol messages↗2026-03-30
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