CVE-2011-1718: The Web Agents component in CA SiteMinder R6 before SP6 CR2 and R12 before SP3 CR2 does not properly handle mu

Routine

MEDIUM 4.3DOWNGRADEDOWNGRADE

CVE-2011-1718 is a medium-severity flaw (CVSS 4.3) affecting siteminder, siteminder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Web Agents component in CA SiteMinder R6 before SP6 CR2 and R12 before SP3 CR2 does not properly handle multi-line headers, which allows remote authenticated users to conduct impersonation attacks and gain privileges via crafted data.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2011-04-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: broadcom · ca

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

Am I affected?

Timeline

2011-04-27 01:25 UTCPublished CVE record published
2026-06-16 23:29 UTCUpdated Record last modified

broadcom siteminder DOWNGRADE

Affected: 12.0 sp3

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.0

1. Check installed version

apt-cache policy siteminder || rpm -q siteminder || siteminder --version

2. No fixed release: DOWNGRADE to a release before 12.0 (Debian / Ubuntu)

apt-cache madison siteminder sudo apt install siteminder=<VERSION_BEFORE_12.0> sudo apt-mark hold siteminder

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

dnf --showduplicates list siteminder sudo dnf downgrade siteminder-<VERSION_BEFORE_12.0> sudo dnf versionlock add siteminder

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.

ca siteminder DOWNGRADE

Affected: 6 sp5_cr35

Fixed in: no fixed release known

Safe to downgrade to: a release before 6

1. Check installed version

apt-cache policy siteminder || rpm -q siteminder || siteminder --version

2. No fixed release: DOWNGRADE to a release before 6 (Debian / Ubuntu)

apt-cache madison siteminder sudo apt install siteminder=<VERSION_BEFORE_6> sudo apt-mark hold siteminder

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

dnf --showduplicates list siteminder sudo dnf downgrade siteminder-<VERSION_BEFORE_6> sudo dnf versionlock add siteminder

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-2011-1718?

siteminder: downgrade or apply the listed mitigation; siteminder: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-1718 being exploited?

CVE-2011-1718 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-2011-1718 affect?

CVE-2011-1718 affects siteminder, siteminder. Severity is medium (CVSS 4.3). The Web Agents component in CA SiteMinder R6 before SP6 CR2 and R12 before SP3 CR2 does not properly handle multi-line headers, which allows remote authenticated users to conduct impersonation attacks and gain privileges via crafted data.

How urgent is CVE-2011-1718?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2013-5968 MEDIUM 4.3 DOWNGRADE DOWNGRADE Cross-site scripting (XSS) vulnerability in CA SiteMinder 12.0 through 12.51, and SiteMinder 6 Web Agents, all
CVE-2011-4054 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in login.fcc in CA SiteMinder R6 SP6 before CR7 and R12 SP3 before CR
CVE-2009-2705 MEDIUM 4.3 MITIGATE MITIGATE CA SiteMinder allows remote attackers to bypass cross-site scripting (XSS) protections for J2EE applications v
CVE-2001-1455 HIGH 7.5 DOWNGRADE Netegrity SiteMinder 3.6 through 4.5.1 allows remote attackers to bypass filtering via URLs containing Unicode
CVE-2000-0850 HIGH 7.5 DOWNGRADE Netegrity SiteMinder before 4.11 allows remote attackers to bypass its authentication mechanism by appending "

References

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