CVE-2021-39016Network attack vector

Traffic-limit bypass via insufficient transmission control

Published Jul 14, 2022 · Updated Sep 17, 2024

IBM Engineering Lifecycle Optimization - Publishing allows remote authenticated users to transmit more network traffic than permitted. The product does not sufficiently monitor or control transmitted traffic volume, but IBM has not published the affected endpoint or code path. Low-privileged network access is required; affected releases are 6.0.6, 6.0.6.1, 7.0, 7.0.1, and 7.0.2, with impact bounded to excess transmission beyond per-actor limits.

CVSS severity4.3
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IBM Engineering Lifecycle Optimization - Publishing allows remote authenticated users to transmit more network traffic than permitted. The product does not sufficiently monitor or control transmitted traffic volume, but IBM has not published the affected endpoint or code path. Low-privileged network access is required; affected releases are 6.0.6, 6.0.6.1, 7.0, 7.0.1, and 7.0.2, with impact bounded to excess transmission beyond per-actor limits.

The record

CVE
CVE-2021-39016
Published
Jul 14, 2022
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Engineering Lifecycle Optimization - Publishing
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2022CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.0.6
  2. Affected versionversion=6.0.6.1
  3. Affected versionversion=7.0
  4. Affected versionversion=7.0.1
  5. Affected versionversion=7.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Engineering Lifecycle Optimization - Publishingversion=6.0.6; version=6.0.6.1; version=7.0; version=7.0.1; version=7.0.2

Published CVSS scores

3.8IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C
4.3IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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