CVE-2021-3323: zephyrproject-rtos zephyr Integer Underflow (Wrap or Wraparound)
CVSS: 9.8v3.1CriticalModified
Published 12-10-2021Last modified 16-09-2024
Vulnerability summary
CVE-2021-3323 is a critical (CVSS 9.8) Integer Underflow (Wrap or Wraparound) vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.7% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
0.92%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 12-10-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
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
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources2 sources · 8.3–9.8
- CVE.orgCNA8.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:LDiffers
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.92%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
0.00 pp
From 0.92% on 19-09-2026
19-09-202619-10-2026
EPSS score0.92%
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, < 2.5.0
Zephyrproject-rtos1 product
- zephyr≥ >=2.4.0, < unspecified
2 vendors · 2 products
References
1 links- github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-89j6-qpxf-pfpcX Refsource MISCExploitPatchThird Party Advisory