CVE-2021-22897
MEDIUMEPSS 86th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit Intelligence
Elevated risk: more likely to be exploited than 86% of all known CVEs.
References
Related Vulnerabilities
Other CWE-840 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-22926 | High | 7.5 | 9.8% | - | Fix |
| CVE-2022-32207 | Critical | 9.8 | 6.9% | - | Fix |
| CVE-2022-32208 | Medium | 5.9 | 6.8% | - | Fix |
| CVE-2021-22922 | Medium | 6.5 | 4.3% | - | Fix |
| CVE-2022-27782 | High | 7.5 | 2.9% | - | Fix |
| CVE-2020-8228 | Medium | 5.3 | 1.9% | - | - |
Common questions
How do I fix CVE-2021-22897?
Upgrade UniversalForwarder to 9.0.6 or later.
Is CVE-2021-22897 being actively exploited?
Not that we know of. CVE-2021-22897 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 86% of all scored CVEs.
How severe is CVE-2021-22897?
CVE-2021-22897 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-22897 affect?
Published advisories record a fix for UniversalForwarder (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2021-22897
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-28.