CVE-2026-83549
CVE-2026-83549 is a security flaw in SonicWall SMA1000 Appliances, SonicWall’s firewall and remote-access equipment. Someone who already has a way in can use SonicWall SMA1000 Appliances to run their own code. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 2 Sep 2026.[1]
SonicWall SMA1000 Appliances is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. SonicWall has published a fix or advice.
Description
CISA calls it an OS command injection in SonicWall SMA1000 Appliances. In its words: “SonicWall SMA1000 Appliances contains an OS command injection vulnerability that could enable a remote authenticated attacker as administrator to execute arbitrary OS commands, resulting in remote code execution.”[1]
The CVE record adds: “Post-authentication Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability has been identified in the SMA1000 Appliance Management Console (AMC) which in specific conditions could potentially enable a remote authenticated attacker as administrator to execute arbitrary OS commands, resulting in remote code execution.”[2]
The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.
It scores 7.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; SonicWall’s advisory has them[3]. CISA names the product as SonicWall SMA1000 Appliances.
Most families won’t have SonicWall SMA1000 Appliances; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 2 Sep 2026, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 5 Sep 2026 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 10%. That’s in the top 5% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
SonicWall has published a fix or advice.[3] CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]
- Check whether you use it.SonicWall SMA1000 Appliances is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 5 Sep 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 7.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 10%.[4] |
See also
Other SonicWall SMA1000 Appliances flaws
- CVE-2026-83548: server-side request forgery ·
- CVE-2026-15410: code injection ·
- CVE-2026-15409: server-side request forgery ·
- CVE-2025-23006: deserialization ·
Other SonicWall flaws
- CVE-2025-40602, SonicWall SMA1000 appliance: sMA1000 missing authorization ·
- CVE-2023-44221, SonicWall SMA100 Appliances: OS command injection ·
- CVE-2021-20035, SonicWall SMA100 Appliances: OS command injection ·
- CVE-2024-53704, SonicWall SonicOS: SSLVPN improper authentication ·
- CVE-2024-40766, SonicWall SonicOS: improper access control ·
Other OS command injection flaws
- CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
- CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
- CVE-2026-49869, Kestra OSS: OSS OS command injection ·
- CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·
- CVE-2026-16812, Arista VeloCloud Orchestrator: on-prem OS command injection ·
Added the same day
- CVE-2026-9586, Sangoma Switchvox: SQL injection ·
- CVE-2026-83548, SonicWall SMA1000 Appliances: server-side request forgery ·
- CVE-2026-82329, JFrog Artifactory: improper authentication ·
- CVE-2026-59822, BerriAI LiteLLM: improper authentication ·
- CVE-2026-49869, Kestra OSS: OSS OS command injection ·
Every SonicWall flaw on CISA’s list · Everything added in September 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “SonicWall SMA1000 Appliances OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 2 Sep 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-83549 Detail”. National Vulnerability Database, published 1 Sep 2026.
- ^ SonicWall. Advisories and fixes: psirt.global.sonicwall.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.099, percentile 95.6, 31 Oct 2026.
- CVE Program. “CVE-2026-83549”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.