CVE-2019-4553Network attack vector

Unauthenticated decryption via weak cryptographic algorithms

Published Mar 24, 2020 · Updated Sep 17, 2024

Weak cryptography in IBM API Connect 5.0.0.0 through 5.0.8.7iFix3 allows remote attackers to decrypt highly sensitive information via network connections. The public record does not identify a specific component or algorithm; it states that weaker-than-expected cryptographic algorithms permit decryption of protected data. Exploitation requires network access but no authentication or user interaction, and the documented impact is confidentiality loss without stated integrity or availability effects.

CVSS severity7.5
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in IBM API Connect 5.0.0.0 through 5.0.8.7iFix3 allows remote attackers to decrypt highly sensitive information via network connections. The public record does not identify a specific component or algorithm; it states that weaker-than-expected cryptographic algorithms permit decryption of protected data. Exploitation requires network access but no authentication or user interaction, and the documented impact is confidentiality loss without stated integrity or availability effects.

The record

CVE
CVE-2019-4553
Published
Mar 24, 2020
Updated
Sep 17, 2024
Vendor
IBM
Product
API Connect
Classifications
CWE-327, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2020CVE 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=5.0.0.0
  2. Affected versionversion=5.0.8.7iFix3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · API Connectversion=5.0.0.0; version=5.0.8.7iFix3

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.9IBM CorporationCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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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