EXPOSURES › CVE-2021-26855

CVE-2021-26855

CRITICAL ⌖ ON CISA KEV · EXPLOITED

DETAIL

SourceCISA-KEV · kev Published2021-11-03 Referencehttps://nvd.nist.gov/vuln/detail/CVE-2021-26855 ↗

⚡ RCE ◐ ZERO-DAY ⌖ EXPLOITED IN THE WILD SHAME 72/100 ransomwarerceexploited-in-wildunpatched

Microsoft Exchange Server vulnerabilities (ProxyLogon) enabled widespread remote code execution, actively exploited by ransomware groups.

CVE-2021-26855, part of the ProxyLogon exploit chain, allowed remote code execution on vulnerable Microsoft Exchange Servers. DIB organizations using unpatched Exchange Servers faced significant exposure to ransomware and data breaches, impacting CMMC compliance. Immediate patching and version upgrades are critical.

Shame score — Systemic validation failures leading to widespread, actively exploited RCE demonstrate significant negligence.

▸ RECOMMENDED ACTION Actively exploited (CISA KEV) — remediate now, ahead of your normal patch cycle.

PLAYERS IMPLICATED

Microsoft · vendor Exchange Server · product

DESCRIPTION

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

SENTIMENT · TRUSTED SOURCES

synthesis severe-fallout -0.60

Microsoft faced severe fallout due to the ProxyLogon exploit chain, widely condemned for allowing remote code execution in Exchange Server, though response was eventually acknowledged.

cooey ↗ severe-fallout -0.80

Severe condemnation for the vulnerability allowing remote code execution in Exchange Server.

"Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain."

app.opencve.io ↗ severe-fallout +0.00