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TI-2021-21531 Aliases CVE-2021-46848GHSA-6468-68pw-9chw

GNU Libtasn1 before 4.19.0 has an ETYPE_OK off-by-one array size check that affects asn1_encode_simple_der.

Priority MEDIUM 50CWE-193Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 6 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

GNU Libtasn1 before 4.19.0 has an ETYPE_OK off-by-one array size check that affects asn1_encode_simple_der.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02823 86th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 3 advisoriesRed Hat: 6 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:gnu:libtasn1:*:*:*:*:*:*:*:*before 4.19.0VulnerableGNU
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*37VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:a:gnu:libtasn1:*:*:*:*:*:*:*:* Versions before 4.19.0 Vulnerable ·GNU
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

Red Hat 3 advisories

  • RHSA-2024:0427 Released 2024-01-25 · Red Hat rating Moderate
    libtasn1 security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) libtasn1-devel-4.13-3.el8_6.1, libtasn1-tools-4.13-3.el8_6.1
    • Red Hat Enterprise Linux BaseOS EUS (v.8.6) libtasn1-4.13-3.el8_6.1
  • RHSA-2023:0343 Released 2023-01-23 · Red Hat rating Moderate
    libtasn1 security update
    • Red Hat Enterprise Linux AppStream (v. 9) libtasn1-devel-4.16.0-8.el9_1, libtasn1-tools-4.16.0-8.el9_1
    • Red Hat Enterprise Linux BaseOS (v. 9) libtasn1-4.16.0-8.el9_1
  • RHSA-2023:0116 Released 2023-01-12 · Red Hat rating Moderate
    libtasn1 security update
    • Red Hat Enterprise Linux AppStream (v. 8) libtasn1-devel-4.13-4.el8_7, libtasn1-tools-4.13-4.el8_7
    • Red Hat Enterprise Linux BaseOS (v. 8) libtasn1-4.13-4.el8_7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Satellite 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:0116
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:0343
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2024:0427
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2023:0116
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2023:0343
Red Hat Enterprise Linux BaseOS EUS (v.8.6)Fixed RHSA-2024:0427
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-46848
  2. 2026-10-03 Alias added: GHSA-6468-68pw-9chw

References

Exploit 1

Patch 2

Advisory 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences