CVE-2026-70571
HighCVSS 8.1Exploitation Probability (EPSS)
Elevated risk60th percentile - higher than 60% of all known CVEs
Summary
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Risk Assessment
The vulnerability can be exploited remotely without authentication, risking full compromise of the mail server and data leakage.
Recommendation
Immediately install security updates for Microsoft Exchange Server and consider limiting the service's internet exposure.
Other vulnerabilities in Microsoft Exchange Server
See all- CVE-2026-70279Critical
Improper neutralization of input during web page generation (cross-site scripting) in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-69641Critical
Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
- CVE-2026-69356Critical
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-55008Critical
A cross-site scripting (XSS) vulnerability in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network. The flaw is due to improper neutralization of input during web page generation.
- CVE-2026-45502Medium
A Server-Side Request Forgery (SSRF) vulnerability in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
- CVE-2026-42897HighActively exploited
Microsoft Exchange Server has an improper neutralization of input during web page generation, leading to a cross-site scripting vulnerability. This flaw allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-21527Medium
A flaw in the user interface of Microsoft Exchange Server leads to misrepresentation of critical information, allowing an unauthorized attacker to perform spoofing over a network.
- CVE-2025-53786High
On April 18th, 2025, Microsoft announced security changes for Exchange Server in hybrid deployments and accompanying hot fixes. Further investigation revealed specific security implications related to these changes.
- CVE-2024-21410CriticalActively exploited
Microsoft Exchange Server Elevation of Privilege Vulnerability. Technical details are not provided in the description.
- CVE-2023-38182High
A vulnerability in Microsoft Exchange Server allows for remote code execution. An attacker can exploit this flaw to gain control over the system.
Original NVD description (English source)
Stack-based buffer overflow in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS