Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-22876

CVE-2021-22876MEDIUM

n/a https://github.com/curl/curl — curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking cre…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  N    5.3   .0530   92.5     —

AFFECTED
  Product                       Versions                         Fixed
  https://github.com/curl/curl  7.1.1 to and including 7.75.0 –  —

TIMELINE
  Jan 6   Reserved by hackerone
  Apr 1   Published (CNA: hackerone)
  Oct 14  EXPLOIT PUBLISHED — CVE-2021-22876 (https://github.com/curl/curl). Public exploit reference added.

CWE-200, CWE-359 · CNA: hackerone · CVSS v3.1 · 12 references · NVD status: Modified

Description

curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 6, 2021	Reserved	Reserved by hackerone
April 1, 2021	Published	Published (CNA: hackerone)
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2021-22876 (https://github.com/curl/curl). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	https://github.com/curl/curl	—	7.1.1 to and including 7.75.0	—

Weaknesses

CWE-200 · CWE-359

References (12)

https://cert-portal.siemens.com/productcert/html/ssa-389290.html
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf [Patch, Third Party Advisory]
https://curl.se/docs/CVE-2021-22876.html [Patch, Vendor Advisory]
https://hackerone.com/reports/1101882 [Exploit, Issue Tracking, Patch, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/ [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/ [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202105-36 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210521-0007/ [Third Party Advisory]
https://www.oracle.com//security-alerts/cpujul2021.html [Third Party Advisory]

Authoritative record: CVE-2021-22876 at cve.org

Weaknesses: CWE-200 · CWE-359

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-22876 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.