CVE-2021-3433
CVE-2021-3433 is a medium-severity vulnerability in Zephyrproject Zephyr with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-703.
Key facts
- Severity: Medium (CVSS 3.x base score 4.0)
- CVSS v2: 2.1
- EPSS exploit prediction: 0% (10th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-703
- Affected product: Zephyrproject Zephyr
- Published:
- Last modified:
Description
Invalid channel map in CONNECT_IND results to Deadlock. Zephyr versions >= v2.5.0 Improper Check or Handling of Exceptional Conditions (CWE-703). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3c2f-w4v6-qxrp
Frequently asked questions
- What is CVE-2021-3433?
- Invalid channel map in CONNECT_IND results to Deadlock. Zephyr versions >= v2.5.0 Improper Check or Handling of Exceptional Conditions (CWE-703). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3c2f-w4v6-qxrp
- How severe is CVE-2021-3433?
- CVE-2021-3433 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2021-3433 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-3433?
- CVE-2021-3433 affects Zephyrproject Zephyr. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-3433?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-3433 published?
- CVE-2021-3433 was published on 2022-06-28 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*
More vulnerabilities in Zephyrproject Zephyr
- CVE-2026-5067 — Critical (CVSS 9.8): A remote, unauthenticated attacker can trigger memory corruption in Zephyr's HTTP server WebSocket upgrade path by…
- CVE-2022-3806 — Critical (CVSS 9.8): Inconsistent handling of error cases in bluetooth hci may lead to a double free condition of a network buffer.
- CVE-2017-14199 — Critical (CVSS 9.8): A buffer overflow has been found in the Zephyr Project's getaddrinfo() implementation in 1.9.0 and 1.10.0.
- CVE-2018-1000800 — Critical (CVSS 9.8): zephyr-rtos version 1.12.0 contains a NULL base pointer reference vulnerability in sys_ring_buf_put(),…
- CVE-2021-3329 — Critical (CVSS 9.6): Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack
- CVE-2023-0397 — Critical (CVSS 9.6): A malicious / defect bluetooth controller can cause a Denial of Service due to unchecked input in…
All CVEs affecting Zephyrproject Zephyr →
Other CWE-703 vulnerabilities
- CVE-2025-13026 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
- CVE-2025-13023 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
- CVE-2025-13022 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
- CVE-2025-13021 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
- CVE-2024-39815 — Critical (CVSS 9.1): Improper check or handling of exceptional conditions vulnerability affecting Vonets industrial wifi bridge relays…
- CVE-2023-45927 — Critical (CVSS 9.1): S-Lang 2.3.2 was discovered to contain an arithmetic exception via the function tt_sprintf().