CVE-2021-43795Network attack vector

Local file disclosure via encoded-slash traversal

Published Dec 2, 2021 · Updated Aug 4, 2024

Path traversal in LINE Corporation Armeria 1.12.0 through 1.13.3 allows remote attackers to read local files via crafted HTTP paths. PathAndQuery's double-dot detection fails when a separator is encoded as %2F, so a FileService request can escape its configured directory. An unauthenticated network request can disclose files readable by the server process, but only deployments exposing FileService routes are affected.

CVSS severity7.5
High
EPSS probability1.64%
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 LINE Corporation Armeria 1.12.0 through 1.13.3 allows remote attackers to read local files via crafted HTTP paths. PathAndQuery's double-dot detection fails when a separator is encoded as %2F, so a FileService request can escape its configured directory. An unauthenticated network request can disclose files readable by the server process, but only deployments exposing FileService routes are affected.

The record

CVE
CVE-2021-43795
Published
Dec 2, 2021
Updated
Aug 4, 2024
Vendor
LINE Corporation
Product
Armeria
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2021CVE 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=< 1.13.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LINE Corporation · Armeriaversion=< 1.13.4

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5GitHub, Inc.CVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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