CVE-2020-36567Public exploitNetwork attack vector

Arbitrary log entry injection via unquoted request paths

Published Dec 27, 2022 · Updated Apr 11, 2025

Log injection in Gin before 1.6.0 allows remote attackers to add arbitrary entries to application logs through crafted request paths. The default Logger formatter passes the decoded request path to fmt.Sprintf with %s, so embedded newline characters become separate records. The application must use an affected Logger middleware; an encoded newline in a request path can forge trusted-looking log entries without authentication.

CVSS severity7.5
High
EPSS probability1.45%
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 Gin before 1.6.0 allows remote attackers to add arbitrary entries to application logs through crafted request paths. The default Logger formatter passes the decoded request path to fmt.Sprintf with %s, so embedded newline characters become separate records. The application must use an affected Logger middleware; an encoded newline in a request path can forge trusted-looking log entries without authentication.

The record

CVE
CVE-2020-36567
Published
Dec 27, 2022
Updated
Apr 11, 2025
Vendor
Gin-Gonic
Product
Gin
Classifications
CWE-116, CWE-117, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 11, 2025Record 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=0 <1.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gin-Gonic · Ginversion=0 <1.6.0

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-117Improper Output Neutralization for Logs
T1565.001Stored Data Manipulation

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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