OServer Out of Bounds Read

published 2014-04-11 12 y ago modified 2026-06-17 4 mo ago also EUVD-2014-0808

cvss: 8.3; version 2.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.4%; EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits: 0; none known

The Modbus slave/outstation driver in the OPC Drivers 1.0.20 and earlier in IOServer OPC Server allows remote attackers to cause a denial of service (out-of-bounds read and daemon crash) via a crafted packet.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-14-100-01 updated 2025-06-09 cvss 8.3

IOServer Out of Bounds Read Vulnerability

IOServer OPC Drivers <=1.0.20
affected: mitigation “IOServer has produced a new version that mitigates the vulnerability. The new version, Beta2112.exe, is available for download here: (http://www.ioserver.com/)”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.40% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	2.0	8.3	AV:N/AC:M/Au:N/C:P/I:P/A:C
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

IOServer OPC Drivers

Classification

Weakness

CWE-125 Out-of-bounds Read
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

cisa.gov /news-events/ics-advisories/icsa-14-100-01
ioserver.com /
ics-cert.us-cert.gov /advisories/ICSA-14-100-01
us-government-resource

Sources

CVE List CVE-2014-0777
NVD CVE-2014-0777

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary