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Public proof of conceptFix available

CVE-2020-36565

A public proof of concept exists; no exploitation attested.

  • Published2022-12-07
  • Fixed in4.2.0 · 4.1.18-0.20201215153152-4422e3b66b9f
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

Timeline

dates in UTC
  1. 2022-12-0717:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-36565?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-36565?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Labstack echoversion to verify
BranchAffectedFixed in
4.2< 4.2.04.2.0
4.1< 4.1.18-0.20201215153152-4422e3b66b9f4.1.18-0.20201215153152-4422e3b66b9f

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Go, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • github.com/labstack/echo/v4other versions: not affected

    https://pkg.go.devplatforms: windows

    Affected
    • < 4.1.18-0.20201215153152-4422e3b66b9ffixed in 4.1.18-0.20201215153152-4422e3b66b9fsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-06-12

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • golang-github-labstack-echoUbuntu:26.10all versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:26.04:LTSall versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:25.10all versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:24.04:LTSall versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:22.04:LTSall versions · no fixed version listed

Full record on NVD

Fix

  1. Update Labstack echo to 4.2.0 · 4.1.18-0.20201215153152-4422e3b66b9f

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2022-12-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-j453-hm5x-c46w

Frequently asked questions

What is CVE-2020-36565?

Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

Is CVE-2020-36565 actively exploited?

A proof-of-concept exploit exists for CVE-2020-36565, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2020-36565?

CVE-2020-36565 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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Sources for this record