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CVE-2021-22143

15
FAUCET Score

CVE-2021-22143 describes a sensitive information disclosure vulnerability in the Elastic APM .NET Agent. When an application error occurs, the agent may fail to sanitize sensitive HTTP header information before sending it to the APM server, potentially leaking confidential data. This vulnerability has a CVSS score of 4.3 (MEDIUM), indicating a low impact on confidentiality with no integrity or availability impact, and can be exploited over the network with low attack complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.10.0CPE matchmatch criteria
cpe:2.3:a:elastic:apm_.net_agent:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.1LOW

CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
0.7
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.61%
Probability of exploitation in next 30 days
EPSS Percentile
45.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0061 is in the 56th percentile among its peer group of 21,977 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

nugetpatch availablevia ghsa
Product: Elastic.ApmFixed in: 1.10.0

Vendor Advisories (1)

nugetGHSA-hx93-gc73-5rprlow

Exposure of Sensitive Information in Elastic APM .NET Agent

Nov 22, 2023

References

discuss.elastic.co / t/elastic-apm-net-agent-1-10-0-security-update/274668
Vendor Advisory
elastic.co / community/security
Vendor Advisory