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CVE-2026-4116: Improper handling of Unicode encoding in SonicWall SMA1000 series appliances allows a remote authenticated SSL

34
Routine
HIGH 7.2UPGRADEUPGRADEUPGRADE

CVE-2026-4116 is a high-severity flaw (CVSS 7.2) affecting sma6210 firmware, sma6200 firmware, sma7200 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper handling of Unicode encoding in SonicWall SMA1000 series appliances allows a remote authenticated SSLVPN user to bypass Workplace/Connect Tunnel TOTP authentication.

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.2 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededHigh
User interactionNone
EPSS exploit chance0.4% (top 64%)
CISA exploited listNo
WeaknessCWE-176
Published2026-04-09
Last modified2026-10-26
Publisher (CNA): SonicWALL, Inc. · Vendor: sonicwall

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

sonicwall sma6210 firmware UPGRADE
Affected: < 12.4.3-03387 · >= 12.5.0 and < 12.5.0-02624
Fixed in: 12.4.3-03387, 12.5.0-02624
Safe to downgrade to: a release before 12.5.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sonicwall sma6200 firmware UPGRADE
Affected: < 12.4.3-03387 · >= 12.5.0 and < 12.5.0-02624
Fixed in: 12.4.3-03387, 12.5.0-02624
Safe to downgrade to: a release before 12.5.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sonicwall sma7200 firmware UPGRADE
Affected: < 12.4.3-03387 · >= 12.5.0 and < 12.5.0-02624
Fixed in: 12.4.3-03387, 12.5.0-02624
Safe to downgrade to: a release before 12.5.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sonicwall sma7210 firmware UPGRADE
Affected: < 12.4.3-03387 · >= 12.5.0 and < 12.5.0-02624
Fixed in: 12.4.3-03387, 12.5.0-02624
Safe to downgrade to: a release before 12.5.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sonicwall sma8200v UPGRADE
Affected: < 12.4.3-03387 · >= 12.5.0 and < 12.5.0-02624
Fixed in: 12.4.3-03387, 12.5.0-02624
Safe to downgrade to: a release before 12.5.0
1. Check installed version
apt-cache policy sma8200v || rpm -q sma8200v || sma8200v --version
2. UPGRADE to 12.4.3-03387 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade sma8200v
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade sma8200v
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 12.5.0 (Debian / Ubuntu)
apt-cache madison sma8200v sudo apt install sma8200v=<VERSION_BEFORE_12.5.0> sudo apt-mark hold sma8200v
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list sma8200v sudo dnf downgrade sma8200v-<VERSION_BEFORE_12.5.0> sudo dnf versionlock add sma8200v
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-2026-4116?

sma6210 firmware: upgrade to 12.4.3-03387, 12.5.0-02624; sma6200 firmware: upgrade to 12.4.3-03387, 12.5.0-02624; sma7200 firmware: upgrade to 12.4.3-03387, 12.5.0-02624. Exact commands for each OS are on this page.

Is CVE-2026-4116 being exploited?

CVE-2026-4116 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-2026-4116 affect?

CVE-2026-4116 affects sma6210 firmware, sma6200 firmware, sma7200 firmware. Severity is high (CVSS 7.2). Improper handling of Unicode encoding in SonicWall SMA1000 series appliances allows a remote authenticated SSLVPN user to bypass Workplace/Connect Tunnel TOTP authentication.

How urgent is CVE-2026-4116?

Priority 34/100. High severity

Software pages

SonicWall vulnerabilities

Related CVEs

References

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