HOMEVULNERABILITIESCVE-2021-22925
MEDIUM

CVE-2021-22925

CWE-200Published: August 5, 2021· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-22925 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

Apple2 product(s)
mac os xmacos
Fedora1 product(s)
fedora
haxx1 product(s)
curl
netapp18 product(s)
cloud backupclustered data ontaphci management nodesolidfireh300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300e+6
Oracle2 product(s)
mysql serverpeoplesoft enterprise peopletools
siemens2 product(s)
sinec infrastructure network servicessinema remote connect server
splunk1 product(s)
universal forwarder
Source: NVD CPE · 39 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
PATCHhttps://hackerone.com/reports/1223882
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
PATCHhttps://www.oracle.com/security-alerts/cpuoct2021.html
PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
PATCHhttps://hackerone.com/reports/1223882
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
PATCHhttps://www.oracle.com/security-alerts/cpuoct2021.html
ADVISORYhttp://seclists.org/fulldisclosure/2021/Sep/39
ADVISORYhttp://seclists.org/fulldisclosure/2021/Sep/40
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
ADVISORYhttps://security.gentoo.org/glsa/202212-01
ADVISORYhttps://security.netapp.com/advisory/ntap-20210902-0003/
ADVISORYhttps://support.apple.com/kb/HT212804
ADVISORYhttps://support.apple.com/kb/HT212805
ADVISORYhttp://seclists.org/fulldisclosure/2021/Sep/39
ADVISORYhttp://seclists.org/fulldisclosure/2021/Sep/40
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
ADVISORYhttps://security.gentoo.org/glsa/202212-01
ADVISORYhttps://security.netapp.com/advisory/ntap-20210902-0003/
ADVISORYhttps://support.apple.com/kb/HT212804
ADVISORYhttps://support.apple.com/kb/HT212805

All References (24)

→
http://seclists.org/fulldisclosure/2021/Sep/39Mailing List · Third Party Advisory
→
http://seclists.org/fulldisclosure/2021/Sep/40Mailing List · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
→
https://hackerone.com/reports/1223882Exploit · 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/202212-01Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210902-0003/Third Party Advisory
→
https://support.apple.com/kb/HT212804Third Party Advisory
→
https://support.apple.com/kb/HT212805Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch · Third Party Advisory
→
http://seclists.org/fulldisclosure/2021/Sep/39Mailing List · Third Party Advisory
→
http://seclists.org/fulldisclosure/2021/Sep/40Mailing List · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-22925
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-200
CISA KEVNo
Affected7 vendor(s)
PublishedAug 5, 2021

Related CVEs (CWE-200)

CVE-2025-53624
10.0
CVE-2008-3914
10.0
CVE-2025-22612
10.0
CVE-2011-3497
10.0
CVE-2026-27604
10.0
CVE-2008-3010
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-22925 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-22925·NVD