HOMEVULNERABILITIESCVE-2021-43795
HIGH

CVE-2021-43795

CWE-22Published: December 2, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Armeria is an open source microservice framework. In affected versions an attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains `%2F` (encoded `/`), such as `/files/..%2Fsecrets.txt`, bypassing Armeria's path validation logic. Armeria 1.13.4 or above contains the hardened path validation logic that handles `%2F` properly. This vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path.

NVD Source

Technical Analysis

CVE-2021-43795 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

linecorp1 product(s)
armeria
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284
PATCHhttps://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284
ADVISORYhttps://github.com/line/armeria/pull/3855
ADVISORYhttps://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv
ADVISORYhttps://github.com/line/armeria/pull/3855
ADVISORYhttps://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv

All References (6)

→
https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284Patch · Third Party Advisory
→
https://github.com/line/armeria/pull/3855Third Party Advisory
→
https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcvThird Party Advisory
→
https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284Patch · Third Party Advisory
→
https://github.com/line/armeria/pull/3855Third Party Advisory
→
https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcvThird Party Advisory

Quick Facts

CVE IDCVE-2021-43795
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
Affected1 vendor(s)
PublishedDec 2, 2021

Related CVEs (CWE-22)

CVE-2026-36767
10.0
CVE-2026-41211
10.0
CVE-2025-52562
10.0
CVE-2025-69770
10.0
CVE-2008-1310
10.0
CVE-2026-11420
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43795 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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