HOME VULNERABILITIESCVE-2021-22924

LOW

CVE-2021-22924

CWE-20Published: August 5, 2021· Updated: Jun 17, 2026

3.7

CVSS v3.1

Official Description

libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.

Technical Analysis

CVE-2021-22924 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.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

haxx1 product(s)

libcurl

netapp4 product(s)

cloud backupclustered data ontapsolidfire \& hci management nodesolidfire baseboard management controller firmware

Oracle2 product(s)

mysql serverpeoplesoft enterprise peopletools

siemens43 product(s)

sinec infrastructure network servicessinema remote connect serverlogo\! cmr2040 firmwarelogo\! cmr2040logo\! cmr2020 firmwarelogo\! cmr2020ruggedcomrm 1224 lte firmwareruggedcomrm 1224 ltescalance m804pb firmwarescalance m804pbscalance m812-1 firmwarescalance m812-1+31

splunk1 product(s)

universal forwarder

Source: NVD CPE · 58 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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/1223565

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/1223565

PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html

PATCHhttps://www.oracle.com/security-alerts/cpuoct2021.html

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf

ADVISORYhttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/08/msg00017.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/08/msg00017.html

ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/

ADVISORYhttps://security.netapp.com/advisory/ntap-20210902-0003/

ADVISORYhttps://www.debian.org/security/2022/dsa-5197

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf

ADVISORYhttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E

ADVISORYhttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/08/msg00017.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/08/msg00017.html

ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/

ADVISORYhttps://security.netapp.com/advisory/ntap-20210902-0003/

ADVISORYhttps://www.debian.org/security/2022/dsa-5197

All References (30)

→

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://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdfThird Party Advisory

→

https://hackerone.com/reports/1223565Exploit · Issue Tracking · Patch · Third Party Advisory

→

https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3EMailing List · Third Party Advisory

→

https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3EMailing List · Third Party Advisory

→

https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3EMailing List · Third Party Advisory

→

https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3EMailing List · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2021/08/msg00017.htmlMailing List · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2022/08/msg00017.htmlMailing List · Third Party Advisory

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/Mailing List · Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20210902-0003/Third Party Advisory

→

https://www.debian.org/security/2022/dsa-5197Third Party Advisory

→

https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory

→

https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-22924

CVSS Score3.7 / 10

SeverityLOW

WeaknessCWE-20

CISA KEVNo

Affected7 vendor(s)

PublishedAug 5, 2021

Related CVEs (CWE-20)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-22924 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-2021-22924·NVD