CVE-2014-0777 | OServer Out of Bounds Read

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.

Published: 2014-04-11 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2014-0777 is rated Moderate Risk (61/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.46%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2014-0777

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 2026-03-28 1.97% 1.46% -0.51%
2 2025-09-25 0.57% 1.97% +1.41%
3 2025-03-30 — 0.57% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2014-0777

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.3 2.0 HIGH
AV:N/AC:M/Au:N/C:P/I:P/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 8.5 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2014-0777

Affected software / configurations for CVE-2014-0777

Vendor Product Version Raw CPE
ioserver ioserver_opc_server — cpe:2.3:a:ioserver:ioserver_opc_server:-:*:*:*:*:*:*:*
ioserver opc_drivers <= 1.0.20 cpe:2.3:a:ioserver:opc_drivers:*:*:*:*:*:*:*:*

References for CVE-2014-0777

cvelogic Threat Intelligence