CVE-2021-27453Network attack vector

Unauthenticated access via default session cookies

Published Dec 21, 2021 · Updated Sep 17, 2024

Authentication bypass in Mesa Laboratories AmegaView 3.0 and earlier allows remote attackers to access its web application. The web application treats attacker-set default cookie values as sufficient to bypass its normal authentication check. No privileges or user interaction are required; exploitation grants unauthorized application access with limited data and service impact.

CVSS severity7.3
High
EPSS probability0.98%
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 Mesa Laboratories AmegaView 3.0 and earlier allows remote attackers to access its web application. The web application treats attacker-set default cookie values as sufficient to bypass its normal authentication check. No privileges or user interaction are required; exploitation grants unauthorized application access with limited data and service impact.

The record

CVE
CVE-2021-27453
Published
Dec 21, 2021
Updated
Sep 17, 2024
Vendor
Mesa Laboratories
Product
AmegaView
Classifications
CWE-288, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mesa Laboratories · AmegaViewversion=unspecified <=3.0

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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