CVE-2020-7611Public exploitNetwork attack vector

SSRF via unvalidated outbound header values

Published Mar 30, 2020 · Updated Aug 4, 2024

HTTP request header injection in Micronaut HTTP Client before 1.2.11 and 1.3.0 through 1.3.1 allows remote attackers to issue crafted HTTP requests. NettyHttpHeaders creates DefaultHttpHeaders with validation disabled, allowing CRLF sequences in an application-supplied value to split one outbound request into attacker-controlled requests and bodies. Exploitation requires an application to copy non-header user input into a client header; the result is SSRF-style requests with attacker-controlled bodies.

CVSS severity9.8
Critical
EPSS probability1.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request header injection in Micronaut HTTP Client before 1.2.11 and 1.3.0 through 1.3.1 allows remote attackers to issue crafted HTTP requests. NettyHttpHeaders creates DefaultHttpHeaders with validation disabled, allowing CRLF sequences in an application-supplied value to split one outbound request into attacker-controlled requests and bodies. Exploitation requires an application to copy non-header user input into a client header; the result is SSRF-style requests with attacker-controlled bodies.

The record

CVE
CVE-2020-7611
Published
Mar 30, 2020
Updated
Aug 4, 2024
Vendor
Micronaut Foundation
Product
Micronaut HTTP Client
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2020CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=all versions before 1.2.11
  2. Affected versionversion=all versions from 1.3.0 before 1.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Micronaut Foundation · Micronaut HTTP Clientversion=all versions before 1.2.11; version=all versions from 1.3.0 before 1.3.2

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

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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