CVE-2021-45485
HIGHCVSS 7.5/10EPSS 3.58%
Last modified
CVE-2021-45485 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.. EPSS estimates a 3.58% chance of exploitation in the next 30 days.
Description
In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.4.276 |
| Linux | Linux Kernel | >= 4.5, < 4.9.276 |
| Linux | Linux Kernel | >= 4.10, < 4.14.240 |
| Linux | Linux Kernel | >= 4.15, < 4.19.198 |
| Linux | Linux Kernel | >= 4.20, < 5.4.133 |
| Linux | Linux Kernel | >= 5.5, < 5.10.51 |
| Linux | Linux Kernel | >= 5.11, < 5.12.18 |
| Linux | Linux Kernel | >= 5.13, < 5.13.3 |
| Netapp | E-Series Santricity Os Controller | All versions |
| Netapp | Solidfire\, Enterprise Sds \& Hci Storage Node | All versions |
| Netapp | Solidfire \& Hci Management Node | All versions |
| Netapp | Brocade Fabric Operating System Firmware | All versions |
| Oracle | Communications Cloud Native Core Binding Support Function | 22.1.3 |
| Oracle | Communications Cloud Native Core Network Exposure Function | 22.1.1 |
| Oracle | Communications Cloud Native Core Policy | 22.2.0 |
| Netapp | All Flash Fabric-Attached Storage 8300 Firmware | All versions |
| Netapp | Fabric-Attached Storage 8300 Firmware | All versions |
| Netapp | All Flash Fabric-Attached Storage 8700 Firmware | All versions |
| Netapp | Fabric-Attached Storage 8700 Firmware | All versions |
| Netapp | Aff A400 Firmware | All versions |
| Netapp | Fabric-Attached Storage A400 Firmware | All versions |
| Netapp | Hci Compute Node Firmware | All versions |
| Netapp | H300e Firmware | All versions |
| Netapp | H300s Firmware | All versions |
| Netapp | H410c Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Netapp | H500e Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H610c Firmware | All versions |
| Netapp | H610s Firmware | All versions |
| Netapp | H615c Firmware | All versions |
| Netapp | H700e Firmware | All versions |
| Netapp | H700s Firmware | All versions |
References
- https://arxiv.org/pdf/2112.09604.pdfTechnical Description, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220121-0001/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://arxiv.org/pdf/2112.09604.pdfTechnical Description, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220121-0001/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-45485?
In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.
How severe is CVE-2021-45485?
CVE-2021-45485 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.58% probability of exploitation in the next 30 days.
How do I fix CVE-2021-45485?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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