CVE-2021-3323
CRITICALCVSS 9.8/10EPSS 0.89%
Last modified
CVE-2021-3323 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Integer Underflow in 6LoWPAN IPHC Header Uncompression in Zephyr. Zephyr versions >= >=2.4.0 contain Integer Underflow (Wrap or Wraparound) (CWE-191). EPSS estimates a 0.89% chance of exploitation in the next 30 days.
Description
Integer Underflow in 6LoWPAN IPHC Header Uncompression in Zephyr. Zephyr versions >= >=2.4.0 contain Integer Underflow (Wrap or Wraparound) (CWE-191). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-89j6-qpxf-pfpc
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zephyrproject | Zephyr | >= 2.4.0, < 2.5.0 |
References
- http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-89j6-qpxf-pfpcExploit, Patch, Third Party Advisory
- http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-89j6-qpxf-pfpcExploit, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3323?
Integer Underflow in 6LoWPAN IPHC Header Uncompression in Zephyr. Zephyr versions >= >=2.4.0 contain Integer Underflow (Wrap or Wraparound) (CWE-191). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-89j6-qpxf-pfpc
How severe is CVE-2021-3323?
CVE-2021-3323 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3323?
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.
Related CVEs from 2021
- CVE-2021-3322Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassemb…6.5
- CVE-2021-33220An issue was discovered in CommScope Ruckus IoT Controller 1…7.8
- CVE-2021-33221An issue was discovered in CommScope Ruckus IoT Controller 1…9.8
- CVE-2021-33223An issue discovered in SeedDMS 6.0.15 allows an attacker to …8.8
- CVE-2021-33224File upload vulnerability in Umbraco Forms v.8.7.0 allows un…9.8
- CVE-2021-33226Buffer Overflow vulnerability in Saltstack v.3003 and before…9.8
- CVE-2021-33231Cross Site Scripting (XSS) vulnerability in New equipment pa…5.4
- CVE-2021-33235Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
- CVE-2021-33236Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
- CVE-2021-33237Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. Consult I…
- CVE-2021-3325Monitorix 3.13.0 allows remote attackers to bypass Basic Aut…9.8
- CVE-2021-33254An issue was discovered in src/http/httpLib.c in EmbedThis A…7.5
Are you affected by CVE-2021-3323?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST