CVE-2026-41954: Sensitive information disclosure vulnerability exists in the undisclosed iControl REST endpoint and TMOS Shell

Routine

MEDIUM 4.9UPGRADEUPGRADEUPGRADE

CVE-2026-41954 is a medium-severity flaw (CVSS 4.9) affecting big-ip access policy manager, big-ip advanced firewall manager, big-ip advanced web application firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sensitive information disclosure vulnerability exists in the undisclosed iControl REST endpoint and TMOS Shell (tmsh) command which may allow an authenticated attacker with resource administrator role privileges to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): F5 Networks · Vendor: f5

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 16:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

f5 big-ip access policy manager UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-access-policy-manager || rpm -q big-ip-access-policy-manager || big-ip-access-policy-manager --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-access-policy-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-access-policy-manager

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-access-policy-manager sudo apt install big-ip-access-policy-manager=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-access-policy-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-access-policy-manager sudo dnf downgrade big-ip-access-policy-manager-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-access-policy-manager

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.

f5 big-ip advanced firewall manager UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-advanced-firewall-manager || rpm -q big-ip-advanced-firewall-manager || big-ip-advanced-firewall-manager --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-advanced-firewall-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-advanced-firewall-manager

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-advanced-firewall-manager sudo apt install big-ip-advanced-firewall-manager=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-advanced-firewall-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-advanced-firewall-manager sudo dnf downgrade big-ip-advanced-firewall-manager-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-advanced-firewall-manager

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.

f5 big-ip advanced web application firewall UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-advanced-web-application-firewall || rpm -q big-ip-advanced-web-application-firewall || big-ip-advanced-web-application-firewall --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-advanced-web-application-firewall

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-advanced-web-application-firewall

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-advanced-web-application-firewall sudo apt install big-ip-advanced-web-application-firewall=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-advanced-web-application-firewall

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-advanced-web-application-firewall sudo dnf downgrade big-ip-advanced-web-application-firewall-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-advanced-web-application-firewall

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.

f5 big-ip analytics UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-analytics || rpm -q big-ip-analytics || big-ip-analytics --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-analytics

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-analytics

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-analytics sudo apt install big-ip-analytics=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-analytics

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-analytics sudo dnf downgrade big-ip-analytics-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-analytics

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.

f5 big-ip application acceleration manager UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-application-acceleration-manager || rpm -q big-ip-application-acceleration-manager || big-ip-application-acceleration-manager --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-application-acceleration-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-application-acceleration-manager

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-application-acceleration-manager sudo apt install big-ip-application-acceleration-manager=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-application-acceleration-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-application-acceleration-manager sudo dnf downgrade big-ip-application-acceleration-manager-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-application-acceleration-manager

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.

f5 big-ip application security manager UPGRADE

Affected: >= 17.1.0 and <= 17.1.3 · >= 17.5.0 and <= 17.5.1 · 21.0.0 · >= 16.1.0 and <= 16.1.6

Fixed in: newer than 17.5.1

Safe to downgrade to: a release before 16.1.0

1. Check installed version

apt-cache policy big-ip-application-security-manager || rpm -q big-ip-application-security-manager || big-ip-application-security-manager --version

2. UPGRADE to newer than 17.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade big-ip-application-security-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade big-ip-application-security-manager

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16.1.0 (Debian / Ubuntu)

apt-cache madison big-ip-application-security-manager sudo apt install big-ip-application-security-manager=<VERSION_BEFORE_16.1.0> sudo apt-mark hold big-ip-application-security-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list big-ip-application-security-manager sudo dnf downgrade big-ip-application-security-manager-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add big-ip-application-security-manager

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-2026-41954?

big-ip access policy manager: upgrade to newer than 17.5.1; big-ip advanced firewall manager: upgrade to newer than 17.5.1; big-ip advanced web application firewall: upgrade to newer than 17.5.1. Exact commands for each OS are on this page.

Is CVE-2026-41954 being exploited?

CVE-2026-41954 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-2026-41954 affect?

CVE-2026-41954 affects big-ip access policy manager, big-ip advanced firewall manager, big-ip advanced web application firewall. Severity is medium (CVSS 4.9). Sensitive information disclosure vulnerability exists in the undisclosed iControl REST endpoint and TMOS Shell (tmsh) command which may allow an authenticated attacker with resource administrator role privileges to view sensitive informatio

How urgent is CVE-2026-41954?

Priority 23/100. No elevated risk signals yet.

Software pages

F5 BIG-IP vulnerabilities

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References

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