CVE-2023-30362

Exp

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.

Published: 2023-06-23 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-30362 is rated High Exploit Risk (62.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.75%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-30362

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-30362

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-24 0.63% 0.75% +0.12%
2 2026-06-15 0.24% 0.63% +0.40%
3 2025-03-30 — 0.24% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-30362

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-30362

OS Trackers for CVE-2023-30362

vendor priority summary link
alpine high CVE-2023-30362: 1 source package rows (libcoap); 1 state rows across 1 repos (3.18-community); fixed 0, open 1. https://security.alpinelinux.org/vuln/CVE-2023-30362
debian not yet assigned CVE-2023-30362 not yet assigned priority: Debian including 1 source packages (libcoap3), 4 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 3, open 1. https://security-tracker.debian.org/tracker/CVE-2023-30362
ubuntu medium CVE-2023-30362 medium priority: Ubuntu including 3 source packages (libcoap, libcoap2, libcoap3), 24 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 12, needs-triage 9, ignored 3. https://ubuntu.com/security/CVE-2023-30362

Affected software / configurations for CVE-2023-30362

Vendor Product Version Raw CPE
libcoap libcoap < 4.3.1-120-ge242200 cpe:2.3:a:libcoap:libcoap:*:*:*:*:*:*:*:*

References for CVE-2023-30362

URL Tags
https://github.com/obgm/libcoap/issues/1063 Exploit Issue Tracking Third Party Advisory
https://github.com/obgm/libcoap/pull/1065 Patch
cvelogic Threat Intelligence