CVE-2021-3455: zephyrproject-rtos zephyr Use After Free
CVSS: 7.5v3.1HighModified
Published 19-10-2021Last modified 16-09-2024
Vulnerability summary
CVE-2021-3455 is a high (CVSS 7.5) Use After Free vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 1.11% chance of exploitation in the next 30 days, higher than 65.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.11%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 19-10-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
Disconnecting L2CAP channel right after invalid ATT request leads freeze. Zephyr versions >= 2.4.0, >= 2.5.0 contain Use After Free (CWE-416). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSources2 sources · 4.3–7.5
- CVE.orgCNA4.3MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.11%
Chance of exploitation in the next 30 days
Percentile
65%
Versus all other CVEs
30-day change
0.00 pp
From 1.11% on 20-09-2026
20-09-202620-10-2026
EPSS score1.11%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundZephyr
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Zephyrproject1 product
- zephyr≥ 2.4.0, < 2.6.0
Zephyrproject-rtos1 product
- zephyr≥ 2.4.0, < unspecified | ≥ 2.5.0, < unspecified
2 vendors · 2 products
References
1 links- github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vpX Refsource MISCExploitThird Party Advisory