CVE-2021-27572Public exploitNetwork attack vector

Code execution via nonce-free command replay

Published May 7, 2021 · Updated Aug 3, 2024

Authentication bypass in Emote Remote Mouse 4.0.0.0 and earlier allows remote attackers to execute arbitrary code via UDP packet replay. The server prepends a static MD5-derived password value to cleartext command packets but uses no cryptographic nonce, so captured keystroke packets remain valid when resent to UDP port 1978. An attacker must first observe a legitimate password-protected session; replayed keystrokes can then launch commands without knowing the password or requiring user interaction.

CVSS severity8.1
High
EPSS probability3.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Emote Remote Mouse 4.0.0.0 and earlier allows remote attackers to execute arbitrary code via UDP packet replay. The server prepends a static MD5-derived password value to cleartext command packets but uses no cryptographic nonce, so captured keystroke packets remain valid when resent to UDP port 1978. An attacker must first observe a legitimate password-protected session; replayed keystrokes can then launch commands without knowing the password or requiring user interaction.

The record

CVE
CVE-2021-27572
Published
May 7, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, T1059.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1059.001PowerShell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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