A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthentic
Affects SonicWall SMA 100 series appliances (SMA 200, 210, 400, 410 and 500v) running firmware 10.2.x, with 10.2.1.2-24sv named as affected in the advisory.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The vulnerability affects SonicWall SMA 100 series appliances (SMA 200, 210, 400, 410, and 500v) that run the Apache httpd server with its mod_cgi module. A remote, unauthenticated attacker could potentially run code on the appliance with the limited privileges of the "nobody" user.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- SonicWall SonicWall SMA100
10.2.0.8-37sv and earlier, 10.2.1.1-19sv and earlier, 10.2.1.2-24sv and earlier
References 3
psirt.global.sonicwall.com
GitHub · jbaines-r7/badblood
Questions about CVE-2021-20038
What does this mean?
A stack-based buffer overflow in the httpd server's mod_cgi module, triggered through environment variables, lets a remote attacker without logging in overflow the stack and run code as the nobody user. The advisory says this can give an attacker complete control of the device.Source: rapid7.com
Am I affected, and how do I check?
Devices running firmware version 10.2.x on SMA 100 series appliances (SMA 200, 210, 400, 410 and 500v) are in scope, and the advisory names 10.2.1.2-24sv specifically. To check, read the firmware version shown on the appliance.Source: rapid7.com
What should I do about it?
The checked facts do not name a fixed firmware version, so no upgrade target can be given from them. Check the SonicWall advisory for the fixed release.Source: rapid7.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-01-28, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts do not include a workaround or mitigation. Consult the SonicWall advisory for guidance on limiting exposure until a fix is available.Source: rapid7.com