CVE-2021-22055Network attack vector

Log entry forgery via carriage-return injection

Published Apr 11, 2022 · Updated Aug 3, 2024

Log injection in SchedulerServer in VMware Photon OS Master build allows remote attackers to forge log entries via the package parameter. SchedulerServer accepts a carriage return in the package parameter and writes the unneutralized value into its logs, allowing injected data to begin fabricated entries. No authentication or user interaction is required; the documented consequence is log-integrity loss rather than code execution or service interruption.

CVSS severity5.3
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in SchedulerServer in VMware Photon OS Master build allows remote attackers to forge log entries via the package parameter. SchedulerServer accepts a carriage return in the package parameter and writes the unneutralized value into its logs, allowing injected data to begin fabricated entries. No authentication or user interaction is required; the documented consequence is log-integrity loss rather than code execution or service interruption.

The record

CVE
CVE-2021-22055
Published
Apr 11, 2022
Updated
Aug 3, 2024
Vendor
VMware
Product
Photon OS
Classifications
CWE-74, T1562.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Master build

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VMware · Photon OSversion=Master build

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1562.001Impair Defenses: Disable or Modify Tools

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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