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-2021-22925

CVE-2021-22925MEDIUM

n/a https://github.com/curl/curl — curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  N    5.3   .0537   92.6     —

AFFECTED
  Product                       Versions                            Fixed
  https://github.com/curl/curl  curl 7.7 to and including 7.77.0 –  —

TIMELINE
  Jan 6   Reserved by hackerone
  Aug 5   Published (CNA: hackerone)
  Oct 14  EXPLOIT PUBLISHED — CVE-2021-22925 (https://github.com/curl/curl). Public exploit reference added.

CWE-908, CWE-200 · CNA: hackerone · CVSS v3.1 · 15 references · NVD status: Modified

Description

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 6, 2021	Reserved	Reserved by hackerone
August 5, 2021	Published	Published (CNA: hackerone)
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2021-22925 (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	—	curl 7.7 to and including 7.77.0	—

Weaknesses

CWE-908 · CWE-200

References (15)

http://seclists.org/fulldisclosure/2021/Sep/39 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/Sep/40 [Mailing List, Third Party Advisory]
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/html/ssa-484086.html
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf [Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf [Third Party Advisory]
https://hackerone.com/reports/1223882 [Exploit, Issue Tracking, Patch, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/ [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202212-01 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210902-0003/ [Third Party Advisory]
https://support.apple.com/kb/HT212804 [Third Party Advisory]
https://support.apple.com/kb/HT212805 [Third Party Advisory]
https://www.oracle.com/security-alerts/cpujan2022.html [Patch, Third Party Advisory]
https://www.oracle.com/security-alerts/cpuoct2021.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-22925 at cve.org

Weaknesses: CWE-908 · CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-22925 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.