CVE-2026-62893: Windows Deployment Services TFTP Server Remote Code Execution Vulnerability
Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
CSIRTS triage
- What
- A use-after-free vulnerability in Windows Deployment Services TFTP server allows remote code execution over a network.
- Who is affected
- Systems running Windows Deployment Services TFTP server that handle untrusted TFTP requests.
- Urgency
- Critical severity (CVSS 9.8); not currently exploited but remotely exploitable without authentication; prioritize immediately.
- Action
- Apply Windows security updates that address CVE-2026-62893 as soon as available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62893
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Moderate exploitation riskCVE-2026-628931.8% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 76% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-62893 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- critical[NEW] [critical] Microsoft Windows Products: Multiple vulnerabilitiescert-bund
- unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
- criticalCVE-2026-62893: Use after free in Windows Deployment Services allows an unauthorized attacker to execute code …nvd
Recent advisories for Windows Deployment Services
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalCVE-2026-62893: Use after free in Windows Deployment Services allows an unauthorized attacker to execute code …nvd · 2026-08-11
- highCVE-2026-49803: Concurrent execution using shared resource with improper synchronization ('race condition') in…nvd · 2026-07-14
- highCVE-2026-42987: Windows Deployment Services (WDS) Remote Code Executionmsrc · 2026-06-09
- criticalexploitedCVE-2019-1130: Microsoft Windows AppX Deployment Service Privilege Escalation Vulnerabilitycisa-kev · 2022-05-23
- criticalexploitedCVE-2019-0841: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerabilitycisa-kev · 2022-03-15
- criticalexploitedCVE-2019-1064: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerabilitycisa-kev · 2022-03-15
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