SonicWall SMA100 Appliances OS Command Injection Vulnerability (CVE-2023-44221)
Published In CISA KEV since Sources: pwn.watch, CVE.org
What is affected, what to do
Improper neutralization of special elements in the SMA100 SSL-VPN management interface allows a remote authenticated attacker with administrative privilege to inject arbitrary commands as a 'nobody' user, potentially leading to OS Command Injection Vulnerability.
The vulnerability is being actively exploited; treat it as a priority. The available sources name no fixed version. Check the vendor guidance in the references below. Immediate actions, mitigation and detection rules are in the runbook below.
- Affected
- SonicWall SMA100
eq 10.2.1.9-57sv and earlier versions..10.2.1.9-57sv and earlier versions
- SonicWall SMA100
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Metrics
7.2
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
7.2
CVSS v3
Severity High on the scale from 0 to 10.
Source: pwn.watch, CVE.org
76.3 %
EPSS score
High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
Source: FIRST EPSS, percentile 99.54
Show all metrics
- Severity
- Critical
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 219.21 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- actively exploited
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 7.2 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 7.2
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 76.3 %
- High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 99.54
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- Actively exploited
- Published
In CISA KEV since
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- CISA assessment (SSVC)
- Exploitation: active · not automatable · Technical impact: total
- Source: CISA Vulnrichment, as of 2 May 2025
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-78
Response and mitigation
Why act now?
Prioritisation rationale
The flaw requires administrator privileges, but attackers routinely chain it with credential theft or authentication-bypass bugs. With an admin session, they get command execution on a perimeter device that usually runs without EDR and has direct reach into the internal network. Exploitation likelihood is very high, and SMA100 appliances are a recurring target for initial access and persistence. CISA does not flag ransomware use, which does nothing to reduce the initial-access risk. If the admin interface is internet-facing or admin accounts lack MFA, treat this as critical and remediate within 24 hours. With strictly segmented management, a "high" rating with patching in the next emergency window is defensible.
Runbook step 1
Immediate response (0-24 h)
- Inventory: Locate every SonicWall SMA 200, 210, 400, 410 and 500v (SMA100 series) and check the firmware version. 10.2.1.9-57sv and all earlier builds are affected.
- Patch: Upgrade to a firmware release later than 10.2.1.9-57sv. The patch is available from the vendor — look up the exact fixed version in the SonicWall PSIRT advisory. Back up the configuration first and verify the image hash.
- Lock down the management interface: Restrict administrative HTTPS access (443/TCP or a dedicated admin port, depending on configuration) to a management network or jump-host allowlist immediately. The admin UI must not be reachable from the internet.
- Rotate admin credentials: Reset all local admin passwords and any bound LDAP/RADIUS service accounts. Kill active admin sessions and enforce MFA for administrators. The flaw requires admin rights, which attackers typically obtain through stolen credentials or session hijacking.
- Check for compromise before patching: Export and preserve admin logs, the local user list and recent configuration changes. If anything looks off, treat the box as compromised: factory-reset with a clean image and rebuild rather than just upgrading.
Runbook step 2
Mitigation layers
- Network segmentation: Expose the admin interface only on a dedicated management VLAN. Egress-filter the appliance to the destinations it actually needs (NTP, DNS, syslog, auth backends, SonicWall update servers). This kills reverse shells and tool staging.
- IAM/least privilege: Minimise the number of admin accounts, eliminate shared logins, require MFA for every admin, and disable dormant accounts.
- IPS/WAF: If a reverse proxy or a TLS-inspecting IPS sits in front of the appliance, block requests to admin paths that carry shell metacharacters in parameters (
;,|,`,$(,&&, encoded%3B,%7C,%60,%24%28). Enable any vendor signatures for CVE-2023-44221. - Session hardening: Configure short admin session timeouts and restrict admin logins to defined source IPs where the device supports it.
- Logging: Forward appliance syslog off-box to the SIEM so attacker-side log wiping does not erase the only evidence.
Runbook step 3
Detection rules
- Admin logins from unusual sources (appliance syslog): successful admin authentications from outside the management range or unexpected geolocations. SPL sketch:
index=sonicwall_sma (admin OR administrator) "login" "success" NOT src_ip IN (10.10.0.0/24) - Outbound connections from the appliance (Zeek conn.log/firewall): new flows from the SMA to internet IPs on odd ports, or long-lived sessions (reverse-shell pattern). KQL sketch:
CommonSecurityLog | where SourceIP == "<SMA-IP>" and DestinationPort !in (53,123,443,514,389,636,1812) | summarize count() by DestinationIP, DestinationPort - Tool staging (Zeek dns.log/http.log): lookups of paste sites or dynamic-DNS domains, raw-file downloads, or
curl/andWget/user agents originating from the appliance. - Configuration drift (appliance event log): new admin accounts, altered authentication servers, or new bookmarks and portal customisations with no matching change ticket.
- Proxy logs (if fronted): Sigma shape
cs-uri-query|contains: [';', '|', '$(', '%3B', '%7C', '%60']scoped to SMA admin paths.
- Admin logins from unusual sources (appliance syslog): successful admin authentications from outside the management range or unexpected geolocations. SPL sketch:
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Improper neutralization of special elements in the SMA100 SSL-VPN management interface allows a remote authenticated attacker with administrative privilege to inject arbitrary commands as a 'nobody' user, potentially leading to OS Command Injection Vulnerability.
Source: pwn.watch, NVD (NIST), cvelistv5, CISA KEV Catalog, CVE.org (MITRE)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| SonicWall | SMA100 |
|
|
Vendors and products
Affected operating systems
| Other | sonicwall | sma_200_firmware | — |
| Other | sonicwall | sma_210_firmware | — |
| Other | sonicwall | sma_400_firmware | — |
| Other | sonicwall | sma_410_firmware | — |
| Other | sonicwall | sma_500v_firmware | — |
Weakness classes (CWE)
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Base
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
Entry at MITRE CWE-78
Public exploit references
Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.
| CISA KEV Catalog | CISA Known Exploited Vulnerability (opens in a new tab)cisa.gov | actively exploited |
References & sources
- psirt.global.sonicwall.comSonicWall advisory: SonicWall SMA100 AppliancesVendor advisory, Vendor advisory, pwn-watch
- cisa.govknown-exploited-vulnerabilities-catalog?field_cve=CVE-2023-44221government-resource, US government resource
- pwn.watchpwn.watch: SonicWall SMA100 Appliances: SMA100 Appliances OS Command Injection Vulnerabilitypwn-watch
- NVD (NIST)NVD: CVE-2023-44221pwn-watch
- cisa.govCISA Known Exploited Vulnerabilities Catalogpwn-watch
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<a href="https://intel.neosec.eu/en/cve/CVE-2023-44221"><img src="https://intel.neosec.eu/badge/cve/CVE-2023-44221.svg?lang=en" alt="CVE-2023-44221 – NEOSEC Intel" height="20"></a>