CVE-2014-0777: The Modbus slave/outstation driver in the OPC Drivers 1.0.20 and earlier in IOServer OPC Server allows remote

Q: How do I fix CVE-2014-0777?

ioserver opc server: mitigate or apply the listed mitigation; opc drivers: upgrade to newer than 1.0.20. Exact commands for each OS are on this page.

Q: Is CVE-2014-0777 being exploited?

CVE-2014-0777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2014-0777 affect?

CVE-2014-0777 affects ioserver opc server, opc drivers. Severity is high (CVSS 8.3). 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.

This month

HIGH 8.3MITIGATEUPGRADE

CVE-2014-0777 is a high-severity flaw (CVSS 8.3) affecting ioserver opc server, opc drivers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-125, CWE-119
Published	2014-04-11
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: ioserver

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-04-11 16:55 UTCPublished CVE record published
2026-06-17 00:03 UTCUpdated Record last modified

ioserver ioserver opc server MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ioserver-opc-server || rpm -q ioserver-opc-server || ioserver-opc-server --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

ioserver opc drivers UPGRADE

Affected: <= 1.0.20

Fixed in: newer than 1.0.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opc-drivers || rpm -q opc-drivers || opc-drivers --version

2. UPGRADE to newer than 1.0.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opc-drivers

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opc-drivers

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2014-0777?

ioserver opc server: mitigate or apply the listed mitigation; opc drivers: upgrade to newer than 1.0.20. Exact commands for each OS are on this page.

Is CVE-2014-0777 being exploited?

CVE-2014-0777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2014-0777 affect?

CVE-2014-0777 affects ioserver opc server, opc drivers. Severity is high (CVSS 8.3). 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.

How urgent is CVE-2014-0777?

Priority 50/100. High severity

References

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