CVE-2020-36629Public exploitNetwork attack vector

Arbitrary file read via followed symbolic links

Published Dec 25, 2022 · Updated Apr 14, 2025

Path traversal in SimbCo httpster before 1.1.0 allows remote attackers to read files outside the served directory through symbolic links. The server passes requested paths to Express static handling without rejecting symbolic links, so a link inside the web root resolves to and serves an outside file. No authentication or user interaction is required when the HTTP service exposes such a link; access is limited to files readable by the server process.

CVSS severity7.5
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in SimbCo httpster before 1.1.0 allows remote attackers to read files outside the served directory through symbolic links. The server passes requested paths to Express static handling without rejecting symbolic links, so a link inside the web root resolves to and serves an outside file. No authentication or user interaction is required when the HTTP service exposes such a link; access is limited to files readable by the server process.

The record

CVE
CVE-2020-36629
Published
Dec 25, 2022
Updated
Apr 14, 2025
Vendor
SimbCo
Product
httpster
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SimbCo · httpsterversion=n/a

Published CVSS scores

5.5VulDB CNACVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.5VulDB CNACVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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