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CVE-2025-53783 is a heap-based buffer overflow vulnerability in Microsoft Teams. Memory corruption can occur when data is written beyond allocated heap memory, potentially allowing an unauthorized network attacker to overwrite critical data or execute malicious code in the context of the Teams application. Successful exploitation requires user interaction, such as following a malicious link or opening a specially crafted file, and requires target-environment information.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer overflow in Microsoft Teams that can be exploited for remote code execution, potentially enabling an attacker to read, write, and delete Teams user messages/data, with high impact to confidentiality, integrity, and availability.
A Microsoft Teams heap-based buffer overflow that could enable remote code execution and manipulation of Teams messages/data, requiring user interaction and a complex chain; patched in August 2025.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.