CVE-2021-43256Disclosure(microsoft / 365_apps)

LOWCVSS 7.8 · HIGH

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 Excel Remote Code Execution Vulnerability

0.5/ 10 priority

Sources & remediation

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

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

  • 365_apps
  • excel
  • excel_rt
  • office

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
Products
365_appsexcelexcel_rtofficeoffice_long_term_servicing_channeloffice_online_serveroffice_web_apps

5 versions affected across 7 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-19: 1Technical Details · 2026-05-19: 105-19
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • Israel@f1tym1
    Disclosure

    CVE-2021-43256 | Microsoft Office up to Web Apps Server 2013 SP1 Excel Remote Code Execution https://ift.tt/l7WhbZK A vulnerability marked as critical has been reported in Microsoft Office. Affected by this issue is some unknown functionality of the component Excel. The manipu…

    Post summary

    A critical remote code execution vulnerability (CVE-2021-43256) affecting Microsoft Office and Web Apps Server 2013 SP1 Excel has been disclosed.

    0000045
    974 followersView on X
CPE platform detail13 entries

13 of 13 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoft365_apps--x64
Appmicrosoft365_apps--x86
Appmicrosoftexcel2013-x64
Appmicrosoftexcel2013-x86
Appmicrosoftexcel2016-x64
Appmicrosoftexcel2016-x86
Appmicrosoftexcel_rt2013--
Appmicrosoftoffice2019-x64
Appmicrosoftoffice2019-x86
Appmicrosoftoffice_long_term_servicing_channel2021-x64
Appmicrosoftoffice_long_term_servicing_channel2021-x86
Appmicrosoftoffice_online_server---
Appmicrosoftoffice_web_apps2013--

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