CVE-2021-41278Network attack vector

Message decryption via fixed unauthenticated CBC encryption

Published Nov 18, 2021 · Updated Aug 4, 2024

Broken encryption in EdgeX Foundry Application Functions SDK for Go before 2.1.0 allows attackers to decrypt pipeline messages. The optional EncryptWithAES transform truncates a SHA-1 digest into a 128-bit AES key, reuses a configured IV for CBC encryption, and adds no authentication tag. Only applications that invoke the AES transform in a processing pipeline are exposed, weakening the confidentiality and integrity of protected messages.

CVSS severity3.7
Low
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken encryption in EdgeX Foundry Application Functions SDK for Go before 2.1.0 allows attackers to decrypt pipeline messages. The optional EncryptWithAES transform truncates a SHA-1 digest into a 128-bit AES key, reuses a configured IV for CBC encryption, and adds no authentication tag. Only applications that invoke the AES transform in a processing pipeline are exposed, weakening the confidentiality and integrity of protected messages.

The record

CVE
CVE-2021-41278
Published
Nov 18, 2021
Updated
Aug 4, 2024
Vendor
EdgeX Foundry
Product
Application Functions SDK for Go
Classifications
CWE-327
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

EdgeX Foundry · Application Functions SDK for Goversion=< 2.1.0

Published CVSS scores

5.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
2.6NIST NVDAV:N/AC:H/Au:N/C:P/I:N/A:N
3.7GitHub, Inc.CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

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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