CVE-2011-2962: Multiple stack-based buffer overflows in Invensys Wonderware Information Server 3.1, 4.0, and 4.0 SP1 allow re

This month

HIGH 9.3DOWNGRADE

CVE-2011-2962 is a high-severity flaw (CVSS 9.3) affecting wonderware information server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stack-based buffer overflows in Invensys Wonderware Information Server 3.1, 4.0, and 4.0 SP1 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via two unspecified ActiveX controls.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-119
Published	2011-07-29
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: invensys

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-07-29 19:55 UTCPublished CVE record published
2026-06-16 23:32 UTCUpdated Record last modified

invensys wonderware information server DOWNGRADE

Affected: 3.1 · 4.0 · 4.0 sp1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

1. Check installed version

apt-cache policy wonderware-information-server || rpm -q wonderware-information-server || wonderware-information-server --version

2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)

apt-cache madison wonderware-information-server sudo apt install wonderware-information-server=<VERSION_BEFORE_3.1> sudo apt-mark hold wonderware-information-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wonderware-information-server sudo dnf downgrade wonderware-information-server-<VERSION_BEFORE_3.1> sudo dnf versionlock add wonderware-information-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2011-2962?

wonderware information server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-2962 being exploited?

CVE-2011-2962 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-2011-2962 affect?

CVE-2011-2962 affects wonderware information server. Severity is high (CVSS 9.3). Multiple stack-based buffer overflows in Invensys Wonderware Information Server 3.1, 4.0, and 4.0 SP1 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via two unspecified ActiveX controls.

How urgent is CVE-2011-2962?

Priority 55/100. Critical severity; EPSS top 8%: very likely to be exploited

Related CVEs

CVE-2014-5399 HIGH 7.5 DOWNGRADE SQL injection vulnerability in Schneider Electric Wonderware Information Server (WIS) Portal 4.0 SP1 through 5
CVE-2014-5398 LOW 2.1 DOWNGRADE Schneider Electric Wonderware Information Server (WIS) Portal 4.0 SP1 through 5.5 allows remote attackers to r
CVE-2014-5397 HIGH 7.5 DOWNGRADE Cross-site scripting (XSS) vulnerability in Schneider Electric Wonderware Information Server (WIS) Portal 4.0
CVE-2014-2381 LOW 2.1 DOWNGRADE Schneider Electric Wonderware Information Server (WIS) Portal 4.0 SP1 through 5.5 uses weak encryption, which
CVE-2014-2380 HIGH 7.8 DOWNGRADE Schneider Electric Wonderware Information Server (WIS) Portal 4.0 SP1 through 5.5 uses weak encryption, which

References

← Back to latest CVEs