HOMEVULNERABILITIESCVE-2021-22897
MEDIUM

CVE-2021-22897

CWE-840Published: June 11, 2021· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

NVD Source

Technical Analysis

CVE-2021-22897 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 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

haxx1 product(s)
curl
netapp20 product(s)
cloud backupsolidfire\, enterprise sds \& hci storage nodesolidfire \& hci management nodesolidfire baseboard management controller firmwarehci compute node firmwarehci compute nodeh300e firmwareh300eh300s firmwareh300sh410s firmwareh410s+8
Oracle7 product(s)
communications cloud native core binding support functioncommunications cloud native core network function cloud native environmentcommunications cloud native core network repository functioncommunications cloud native core network slice selection functioncommunications cloud native core service communication proxyessbasemysql server
siemens1 product(s)
sinec infrastructure network services
splunk1 product(s)
universal forwarder
Source: NVD CPE · 32 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://curl.se/docs/CVE-2021-22897.html
PATCHhttps://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
PATCHhttps://curl.se/docs/CVE-2021-22897.html
PATCHhttps://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
ADVISORYhttps://hackerone.com/reports/1172857
ADVISORYhttps://security.netapp.com/advisory/ntap-20210727-0007/
ADVISORYhttps://hackerone.com/reports/1172857
ADVISORYhttps://security.netapp.com/advisory/ntap-20210727-0007/
ADVISORYhttps://hackerone.com/reports/1172857

All References (17)

→
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch · Third Party Advisory
→
https://curl.se/docs/CVE-2021-22897.htmlPatch · Vendor Advisory
→
https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511Patch · Third Party Advisory
→
https://hackerone.com/reports/1172857Exploit · Issue Tracking · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210727-0007/Third Party Advisory
→
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch · Third Party Advisory
→
https://curl.se/docs/CVE-2021-22897.htmlPatch · Vendor Advisory
→
https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511Patch · Third Party Advisory
→
https://hackerone.com/reports/1172857Exploit · Issue Tracking · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210727-0007/Third Party Advisory
→
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-22897
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-840
CISA KEVNo
Affected5 vendor(s)
PublishedJun 11, 2021

Related CVEs (CWE-840)

CVE-2022-32207
9.8
CVE-2021-4171
9.8
CVE-2022-4719
9.8
CVE-2022-3363
9.8
CVE-2025-2938
8.8
CVE-2023-6514
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-22897 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-2021-22897·NVD