Microsoft Exchange Server Privilege Escalation Vulnerability

Description

References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34523 · Patch
• packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html · Exploit
• portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523 · Patch
• zerodayinitiative.com/advisories/ZDI-21-822 · Third Party Advisory
• cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
• CISA KEV · CVE-2021-34523

Weitere Schwachstellen in exchange server

• CVE-2026-87696HOCH 7.5Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a net…
• CVE-2026-87695HOCH 7.8Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges lo…
• CVE-2026-87692HOCH 7.8Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
• CVE-2026-96940HOCH 8.8Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2026-69641KRITISCH 9.1Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.