CVE-2022-21671Network attack vector

Repl compromise via obsolete fallback proxy

Published Jan 11, 2022 · Updated Apr 23, 2025

Information exposure in Replit Crosis before 7.3.1 allows remote attackers to obtain Repl tokens through a fallback polling proxy. The getConnectionStr helper substitutes gp-v2.herokuapp.com as the polling host and places connectionMetadata.token in the /wsv2 request path. Standalone use and repeated WebSocket failures trigger the fallback; control of the obsolete proxy exposes a token that permits full compromise of the Repl, but not the account.

CVSS severity8.1
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Replit Crosis before 7.3.1 allows remote attackers to obtain Repl tokens through a fallback polling proxy. The getConnectionStr helper substitutes gp-v2.herokuapp.com as the polling host and places connectionMetadata.token in the /wsv2 request path. Standalone use and repeated WebSocket failures trigger the fallback; control of the obsolete proxy exposes a token that permits full compromise of the Repl, but not the account.

The record

CVE
CVE-2022-21671
Published
Jan 11, 2022
Updated
Apr 23, 2025
Vendor
Replit
Product
Crosis
Classifications
CWE-200, T1528
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 7.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Replit · Crosisversion=< 7.3.1

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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