CVE-2023-26793

Exp

libmodbus v3.1.10 has a heap-based buffer overflow vulnerability in read_io_status function in src/modbus.c.

Published: 2024-05-01 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-26793 is rated High Exploit Risk (71.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.73%). 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-2023-26793

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

Exploit prediction scoring system (EPSS) score for CVE-2023-26793

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 2026-06-15 0.89% 0.73% -0.16%
2 2026-02-13 1.18% 0.89% -0.29%
3 2025-11-21 — 1.18% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-26793

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-26793

OS Trackers for CVE-2023-26793

vendor priority summary link
alpine — CVE-2023-26793: 1 source package rows (libmodbus); 3 state rows across 3 repos (3.22-community, 3.23-community, edge-community); fixed 0, open 3. https://security.alpinelinux.org/vuln/CVE-2023-26793
suse medium — https://www.suse.com/security/cve/CVE-2023-26793/
ubuntu medium CVE-2023-26793 medium priority: Ubuntu including 1 source packages (libmodbus), 11 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 8, ignored 3. https://ubuntu.com/security/CVE-2023-26793

Affected software / configurations for CVE-2023-26793

Vendor Product Version Raw CPE
libmodbus libmodbus 3.1.10 cpe:2.3:a:libmodbus:libmodbus:3.1.10:*:*:*:*:*:*:*

References for CVE-2023-26793

URL Tags
https://github.com/stephane/libmodbus/issues/683 Exploit Issue Tracking Vendor Advisory
cvelogic Threat Intelligence