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Fencer Vulns
medium 5.5

CVE-2021-3798 json

A flaw was found in openCryptoki.

published 2022-08-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27058

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

A flaw was found in openCryptoki. The openCryptoki Soft token does not check if an EC key is valid when an EC key is created via C_CreateObject, nor when C_DeriveKey is used with ECDH public data. This may allow a malicious user to extract the private key by performing an invalid curve attack.

Patch / fix

  • opencryptoki_project opencryptoki 3.17.0
  • opencryptoki RHEL 8 3.15.1-6.el8_4
  • opencryptoki-libs RHEL 8 3.15.1-6.el8_4
  • opencryptoki-swtok RHEL 8 3.15.1-6.el8_4
  • opencryptoki-ccatok RHEL 8 3.15.1-6.el8_4
  • opencryptoki-icatok RHEL 8 3.15.1-6.el8_4
  • opencryptoki-tpmtok RHEL 8 3.15.1-6.el8_4
  • opencryptoki-ep11tok RHEL 8 3.15.1-6.el8_4
  • opencryptoki-icsftok RHEL 8 3.15.1-6.el8_4

red hat advisories RHBA-2021:3054

  • opencryptoki CBL-Mariner 2.0 3.17.0-1

azure linux advisories AZL-10659

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3798 updated cvss 5.1

openCryptoki: Soft token does not check if an EC key is valid

  • Red Hat CodeReady Linux Builder (v. 8) opencryptoki-devel 3.15.1-6.el8_4, opencryptoki-debuginfo 3.15.1-6.el8_4, opencryptoki-debugsource 3.15.1-6.el8_4, opencryptoki-libs-debuginfo 3.15.1-6.el8_4, opencryptoki-swtok-debuginfo 3.15.1-6.el8_4, opencryptoki-ccatok-debuginfo 3.15.1-6.el8_4, +4 more Red Hat Enterprise Linux BaseOS (v. 8) opencryptoki 3.15.1-6.el8_4, opencryptoki-libs 3.15.1-6.el8_4, opencryptoki-swtok 3.15.1-6.el8_4, opencryptoki-ccatok 3.15.1-6.el8_4, opencryptoki-icatok 3.15.1-6.el8_4, opencryptoki-tpmtok 3.15.1-6.el8_4, +2 more
    fixed: vendor fix RHBA-2021:3054
  • Red Hat Enterprise Linux 6 opencryptoki, opencryptoki-libs Red Hat Enterprise Linux 7 opencryptoki, opencryptoki-libs, opencryptoki-swtok, opencryptoki-ccatok, opencryptoki-icatok, opencryptoki-tpmtok, +2 more Red Hat Enterprise Linux 9 opencryptoki, opencryptoki-libs, opencryptoki-swtok, opencryptoki-ccatok, opencryptoki-icatok, opencryptoki-ep11tok, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • n/a opencryptoki

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.