CVE-2021-4209: Null Pointer Dereference
First published: Mon Jan 24 2022(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/gnutls | <3.7.3 | 3.7.3 |
| GNU GnuTLS | <3.7.3 | |
| Redhat Enterprise Linux | =8.0 | |
| Netapp Active Iq Unified Manager Vmware Vsphere | ||
| Netapp Solidfire \& Hci Management Node | ||
| Netapp Hci Bootstrap Os | ||
| Netapp Hci Compute Node |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-4209
- https://bugzilla.redhat.com/show_bug.cgi?id=2044156
- https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
- https://gitlab.com/gnutls/gnutls/-/issues/1306
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
- https://security.netapp.com/advisory/ntap-20220915-0005/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2055368
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2055369
Frequently Asked Questions
What is CVE-2021-4209?
CVE-2021-4209 is a NULL pointer dereference flaw in GnuTLS that can cause a denial of service after authentication in rare circumstances.
How does CVE-2021-4209 affect GnuTLS?
CVE-2021-4209 affects GnuTLS versions up to and excluding 3.7.3, leading to a denial of service vulnerability.
What is the severity of CVE-2021-4209?
CVE-2021-4209 has a severity rating of 6.5 (medium).
Which software versions are affected by CVE-2021-4209?
GnuTLS versions up to and excluding 3.7.3 are affected by CVE-2021-4209.
How can I fix CVE-2021-4209?
To fix CVE-2021-4209, it is recommended to update GnuTLS to version 3.7.3 or higher.
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