CVE-2021-41033Network attack vector

Code execution via intercepted HTTP repository metadata

Published Sep 13, 2021 · Updated Aug 4, 2024

Man-in-the-middle flaw in Eclipse Equinox p2 through 4.21 allows attackers to alter installations via HTTP update repositories. The p2 client accepts repository metadata over unencrypted HTTP, enabling an on-path attacker to replace metadata, redirect artifact retrieval, and provide matching attacker-controlled checksums. Exploitation requires an installation or update from an HTTP p2 repository and control of its network path; injected plug-ins then execute code in the affected application.

CVSS severity8.1
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Man-in-the-middle flaw in Eclipse Equinox p2 through 4.21 allows attackers to alter installations via HTTP update repositories. The p2 client accepts repository metadata over unencrypted HTTP, enabling an on-path attacker to replace metadata, redirect artifact retrieval, and provide matching attacker-controlled checksums. Exploitation requires an installation or update from an HTTP p2 repository and control of its network path; injected plug-ins then execute code in the affected application.

The record

CVE
CVE-2021-41033
Published
Sep 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-300, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 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?

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

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

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-300Channel Accessible by Non-Endpoint
T1557Adversary-in-the-Middle

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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