CVE-2021-4209
Ubuntu Security Notice USN-5750-1
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
Se ha encontrado un fallo de desreferencia de puntero NULL en GnuTLS. Como las funciones de actualización de hash de Nettle llaman internamente a memcpy, proporcionar una entrada de longitud cero puede causar un comportamiento indefinido. Este fallo conlleva a una denegación de servicio tras la autenticación en raras circunstancias.
It was discovered that GnuTLS incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. It was discovered that GnuTLS incorrectly handled the verification of certain pkcs7 signatures. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2022-01-24 CVE Reserved
- 2022-08-05 CVE Published
- 2024-08-03 CVE Updated
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-476: NULL Pointer Dereference
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-4209 | Third Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2044156 | Issue Tracking | |
| https://gitlab.com/gnutls/gnutls/-/issues/1306 | Third Party Advisory | |
| https://gitlab.com/gnutls/gnutls/-/merge_requests/1503 | Third Party Advisory | |
| https://security.netapp.com/advisory/ntap-20220915-0005 | Third Party Advisory |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568 | 2022-10-27 |
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Netapp Search vendor "Netapp" | Hci Bootstrap Os Search vendor "Netapp" for product "Hci Bootstrap Os" | - | - |
Affected
| in | Netapp Search vendor "Netapp" | Hci Compute Node Search vendor "Netapp" for product "Hci Compute Node" | - | - |
Safe
|
| Gnu Search vendor "Gnu" | Gnutls Search vendor "Gnu" for product "Gnutls" | < 3.7.3 Search vendor "Gnu" for product "Gnutls" and version " < 3.7.3" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager" | - | vmware_vsphere |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Solidfire \& Hci Management Node Search vendor "Netapp" for product "Solidfire \& Hci Management Node" | - | - |
Affected
| ||||||