CVE-2022-39334

Credential disclosure via default TLS error acceptance

Published Nov 25, 2022 · Updated Nov 3, 2025

Improper certificate validation in Nextcloud nextcloudcmd before 3.6.1 allows man-in-the-middle attackers to read credentials over TLS. The nextcloudcmd TLS error handler accepted invalid certificates by default instead of rejecting their errors unless the --trust option was supplied. Exploitation requires a local user to run nextcloudcmd while a network attacker intercepts its TLS connection, exposing transmitted credentials or sensitive data.

CVSS severity2.8
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Nextcloud nextcloudcmd before 3.6.1 allows man-in-the-middle attackers to read credentials over TLS. The nextcloudcmd TLS error handler accepted invalid certificates by default instead of rejecting their errors unless the --trust option was supplied. Exploitation requires a local user to run nextcloudcmd while a network attacker intercepts its TLS connection, exposing transmitted credentials or sensitive data.

The record

CVE
CVE-2022-39334
Published
Nov 25, 2022
Updated
Nov 3, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-295, CAPEC-459, CAPEC-475, T1557
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=< 3.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 3.6.1

Published CVSS scores

2.8GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-459Creating a Rogue Certification Authority Certificate
CAPEC-475Signature Spoofing by Improper Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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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