What is CVE-2023-30362?

CVE-2023-30362 is a high-severity vulnerability in Libcoap, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2023-06-23.

How severe is CVE-2023-30362?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Libcoap

CVE-2023-30362

Buffer Overflow vulnerability in coap_send function in libcoap library 4.3.1-103-g52cfd56 fixed in 4.3.1-120-ge242200 allows attackers to obtain sensitive information via malformed pdu.

Vulnerability class: Buffer Overflow

Published 2023-06-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Libcoap

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/obgm/libcoap/issues/1063 (Exploit, Third Party Advisory, Issue Tracking)
github.com/obgm/libcoap/pull/1065 (Patch)

Frequently asked questions

What is CVE-2023-30362?: CVE-2023-30362 is a high-severity vulnerability in Libcoap, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2023-06-23.
How severe is CVE-2023-30362?: High severity. CVSS v3 base score is 7.5 out of 10.