CVE-2021-22897

moderate-risk
Published 2021-06-11

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.

Do I need to act?

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0.79% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Oracle Siemens Haxx Netapp Splunk

References (16)

Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Patch https://curl.se/docs/CVE-2021-22897.html
Patch https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
Exploit https://hackerone.com/reports/1172857
Third Party Advisory https://security.netapp.com/advisory/ntap-20210727-0007/
Patch https://www.oracle.com//security-alerts/cpujul2021.html
Patch https://www.oracle.com/security-alerts/cpuapr2022.html
Patch https://www.oracle.com/security-alerts/cpujan2022.html
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Patch https://curl.se/docs/CVE-2021-22897.html
Patch https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
Exploit https://hackerone.com/reports/1172857
Third Party Advisory https://security.netapp.com/advisory/ntap-20210727-0007/
Patch https://www.oracle.com//security-alerts/cpujul2021.html
Patch https://www.oracle.com/security-alerts/cpuapr2022.html
Patch https://www.oracle.com/security-alerts/cpujan2022.html
45
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 3/34 · Minimal
Exposure 21/34 · High