CVE-2022-36071Public exploitNetwork attack vector

Two-factor authentication bypass via premature recovery codes

Published Sep 2, 2022 · Updated Apr 22, 2025

Improper authentication in SFTPGo 2.2.0 through 2.3.3 allows remote authenticated users to bypass two-factor authentication. The WebClient MFA page generates and stores recovery codes before TOTP enrollment is enabled, leaving codes valid after later enrollment. An attacker must know the account password and preserve a prematurely generated code, which then substitutes for the second factor during login.

CVSS severity8.3
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in SFTPGo 2.2.0 through 2.3.3 allows remote authenticated users to bypass two-factor authentication. The WebClient MFA page generates and stores recovery codes before TOTP enrollment is enabled, leaving codes valid after later enrollment. An attacker must know the account password and preserve a prematurely generated code, which then substitutes for the second factor during login.

The record

CVE
CVE-2022-36071
Published
Sep 2, 2022
Updated
Apr 22, 2025
Vendor
SOFTWARE ENGINEERING S.R.L.
Product
SFTPGo
Classifications
CWE-916, CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=>= 2.2.0, < 2.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SOFTWARE ENGINEERING S.R.L. · SFTPGoversion=>= 2.2.0, < 2.3.4

Published CVSS scores

8.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-916Use of Password Hash With Insufficient Computational Effort
CWE-287Improper Authentication
T1078Valid Accounts

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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