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CVE-2021-4209

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Date: August 24, 2022

A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

Language: C

Severity Score

Related Resources (10)

https://nvd.nist.gov/vuln/detail/CVE-2021-4209
https://security.netapp.com/advisory/ntap-20220915-0005/
https://security-tracker.debian.org/tracker/CVE-2021-4209
https://access.redhat.com/security/cve/CVE-2021-4209
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4209
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
https://gitlab.com/gnutls/gnutls/-/issues/1306
https://bugzilla.redhat.com/show_bug.cgi?id=2044156
https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
https://www.mend.io/vulnerability-database/CVE-2021-4209

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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