CVE-2022-27776Network attack vector

Credential disclosure via incomplete redirect-origin check

Published Jun 1, 2022 · Updated Nov 20, 2024

Credential exposure in curl 4.9 through 7.82.0 allows remote attackers to read authentication and cookie headers through HTTP redirects. Curl_http_output_auth and Curl_add_custom_headers compare only the original hostname on a followed redirect, ignoring a changed port or URL scheme. Exploitation requires a followed redirect while custom Authorization or Cookie headers are attached, exposing those credentials to a server reached on the alternate origin.

CVSS severity6.5
Medium
EPSS probability3.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in curl 4.9 through 7.82.0 allows remote attackers to read authentication and cookie headers through HTTP redirects. Curl_http_output_auth and Curl_add_custom_headers compare only the original hostname on a followed redirect, ignoring a changed port or URL scheme. Exploitation requires a followed redirect while custom Authorization or Cookie headers are attached, exposing those credentials to a server reached on the alternate origin.

The record

CVE
CVE-2022-27776
Published
Jun 1, 2022
Updated
Nov 20, 2024
Vendor
curl
Product
curl
Classifications
CWE-522, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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=fixed in curl 7.83.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=fixed in curl 7.83.0

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-522Insufficiently Protected Credentials
T1539Steal Web Session Cookie

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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