CVE-2021-29847Network attack vector

Information disclosure via stale BMC web-port configuration

Published Dec 15, 2021 · Updated Sep 16, 2024

Information disclosure in IBM Power System S821LC BMC firmware OP825.50 allows man-in-the-middle attackers to read sensitive data. The BMC web-port configuration can remain out of sync with the setting shown in its user interface, leaving port 80 enabled as an insecure channel. Exploitation requires an authenticated user to open the channel and an attacker positioned to intercept its traffic; reported impact is sensitive-information disclosure only.

CVSS severity5.3
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IBM Power System S821LC BMC firmware OP825.50 allows man-in-the-middle attackers to read sensitive data. The BMC web-port configuration can remain out of sync with the setting shown in its user interface, leaving port 80 enabled as an insecure channel. Exploitation requires an authenticated user to open the channel and an attacker positioned to intercept its traffic; reported impact is sensitive-information disclosure only.

The record

CVE
CVE-2021-29847
Published
Dec 15, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
Power System S821LC
Classifications
T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=OP825.50

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Power System S821LCversion=OP825.50

Published CVSS scores

5.3IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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