VulnSocial

CVE-2021-28480Disclosure(microsoft / exchange_server)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Microsoft Exchange Server Remote Code Execution Vulnerability

microsoft CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Patch / fix

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • exchange_server

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-02-17); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
microsoft
Products
exchange_server

3 versions affected across 1 product

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-02-17: 1Mentions · 2026-03-17: 1Technical Details · 2026-02-17: 102-1703-17
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • ET Labs@ET_Labs
    Disclosure

    35 new OPEN, 66 new PRO (35 + 31) ACR Stealer, Katana Botnet, Lumma Stealer, NetSupport RAT, TA4903, TA569, XWorm, FreePBX (CVE-2026-28287), Linksys (CVE-2025-34037), Microsoft Exchange (CVE-2021-28480, CVE-2021-28481), Nginx-ui (CVE-2026-27944) and more. https://community.emergingthreats.net/t/ruleset-update-summary-2026-03-17-v11150/3235 https://t.co/SNltFetetX

    Post summary

    The post lists newly identified CVEs across various products, presenting them as a disclosure without providing exploitation code, evidence of active attacks, or mitigation details.

    03050465
    5.7K followersView on X
  • pdnuclei-bot@pdnuclei_bot
    Disclosure

    🚨 CVE-2021-28480 - critical 🚨 Microsoft Exchange - Pre-Auth SSRF / ACL Bypass (ProxyNotFound) > Microsoft Exchange Server contains a remote code execution caused by improper input v... 👾 https://cloud.projectdiscovery.io/library/CVE-2021-28480 @pdnuclei #NucleiTemplates #cve

    Post summary

    The tweet announces CVE-2021-28480, describing it as a pre‑authentication SSRF/ACL bypass that leads to remote code execution in Microsoft Exchange, and provides a link to a detection template.

    00011196
    888 followersView on X
CPE platform detail5 entries

5 of 5 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoftexchange_server2013--
Appmicrosoftexchange_server2016--
Appmicrosoftexchange_server2016--
Appmicrosoftexchange_server2019--
Appmicrosoftexchange_server2019--

Explore more

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