CVE-2025-49744 Overview
CVE-2025-49744 is a heap-based buffer overflow [CWE-122] in the Microsoft Graphics Component. The flaw allows an authorized local attacker to elevate privileges on affected Windows endpoints and servers. Successful exploitation grants the attacker the ability to run code in a higher-privileged context, compromising confidentiality, integrity, and availability of the host.
Microsoft published the advisory on July 8, 2025, and the entry was last updated on July 17, 2025. The issue affects a broad set of Windows client and server releases, including Windows 10, Windows 11, and Windows Server 2016 through Windows Server 2025.
Critical Impact
A low-privileged local attacker can corrupt heap memory in the Microsoft Graphics Component to gain elevated privileges, leading to full host compromise.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
- Microsoft Windows Server 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-07-08 - CVE-2025-49744 published to NVD with vendor advisory from Microsoft
- 2025-07-17 - Last updated in NVD database
Technical Details for CVE-2025-49744
Vulnerability Analysis
The vulnerability is a heap-based buffer overflow within the Microsoft Graphics Component, the subsystem responsible for rendering graphics primitives, fonts, and images on Windows. An authenticated local user can trigger the flaw by supplying crafted graphics data that exceeds the bounds of a heap-allocated buffer. The overflow corrupts adjacent heap metadata or object pointers, allowing the attacker to redirect execution flow inside a more privileged process.
Because the Graphics Component is reachable from user-mode code paths that interact with kernel graphics services, a successful overflow can yield privilege escalation from a standard user context to SYSTEM. Exploitation requires local access and elevated attack complexity, indicating that timing, memory layout manipulation, or heap grooming is required for reliable code execution.
Root Cause
The root cause is improper validation of the size or length of attacker-controlled input before it is written into a fixed-size heap buffer in the Graphics Component. This classic [CWE-122] pattern enables out-of-bounds writes that overwrite adjacent heap structures.
Attack Vector
The attack vector is local. The attacker must already have authenticated access to the target with low privileges, but no user interaction from another account is required. After establishing a foothold through phishing, credential theft, or other initial access methods, an attacker invokes the vulnerable graphics code path to corrupt memory and escalate privileges.
No verified public proof-of-concept code is referenced in the NVD entry. Technical details remain limited to the Microsoft Security Update Guide for CVE-2025-49744.
Detection Methods for CVE-2025-49744
Indicators of Compromise
- Unexpected crashes of csrss.exe, dwm.exe, or other processes hosting graphics rendering routines, with heap corruption stack traces in Windows Error Reporting (WER).
- Standard user processes spawning child processes running as NT AUTHORITY\SYSTEM shortly after loading graphics-related modules.
- Creation of new local administrator accounts, services, or scheduled tasks immediately following anomalous graphics process behavior.
Detection Strategies
- Hunt for low-privileged processes that invoke graphics APIs and subsequently obtain SYSTEM-level tokens or impersonate higher-privileged users.
- Correlate WER and kernel crash dumps referencing the Graphics Component with subsequent privilege changes on the same host.
- Apply behavioral identification rules for local privilege escalation patterns rather than relying solely on signature-based detection, since no public exploit signatures are available.
Monitoring Recommendations
- Enable Windows Event Log forwarding for Security, System, and Application channels and ingest into a centralized analytics platform.
- Monitor Sysmon Event ID 1 (process creation) and Event ID 10 (process access) for anomalous parent/child relationships involving graphics-related binaries.
- Track patch deployment status across all Windows 10, Windows 11, and Windows Server hosts to identify systems that remain exposed.
How to Mitigate CVE-2025-49744
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft Security Update Guide for CVE-2025-49744 to all affected Windows client and server systems.
- Prioritize patching on multi-user systems, jump hosts, and terminal servers where local privilege escalation provides the greatest adversary value.
- Audit local user accounts and remove unnecessary interactive logon rights on servers to shrink the local attack surface.
Patch Information
Microsoft released fixes through the July 2025 Patch Tuesday cycle. Administrators should deploy the cumulative update corresponding to each affected Windows build and verify installation through Get-HotFix or Windows Update for Business reports. Refer to the vendor advisory for build-specific KB identifiers.
Workarounds
- No vendor-supplied workaround is documented; patching is the supported remediation path.
- Enforce least privilege and restrict local logon to trusted administrators on critical systems until patches are applied.
- Apply application control policies such as Windows Defender Application Control (WDAC) or AppLocker to limit which unsigned binaries low-privileged users can execute.
# Verify the relevant July 2025 cumulative update is installed
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 10
# Force Windows Update scan and install pending updates
UsoClient StartScan
UsoClient StartDownload
UsoClient StartInstall
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.