CVE-2021-22143

Sensitive header disclosure via unsanitized error context

Published Nov 22, 2023 · Updated Oct 11, 2024

Sensitive information exposure in Elastic APM .NET Agent before 1.10.0 allows attackers to read sensitive HTTP headers from error data. The error-reporting path copied request headers into Error.Context and queued them for APM Server without applying SanitizeFieldNames. Exposure requires captured HTTP headers, an application error, and access to resulting APM error data; no integrity or availability impact is reported.

CVSS severity2.1
Low
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in Elastic APM .NET Agent before 1.10.0 allows attackers to read sensitive HTTP headers from error data. The error-reporting path copied request headers into Error.Context and queued them for APM Server without applying SanitizeFieldNames. Exposure requires captured HTTP headers, an application error, and access to resulting APM error data; no integrity or availability impact is reported.

The record

CVE
CVE-2021-22143
Published
Nov 22, 2023
Updated
Oct 11, 2024
Vendor
Elastic
Product
Elastic APM .NET Agent
Classifications
CWE-532, CWE-200
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Nov 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 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=1.0.0 <1.10.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Elastic · Elastic APM .NET Agentversion=1.0.0 <1.10.0

Published CVSS scores

2.1ElasticCVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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