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CVE detail

CVE-2021-20038

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.

CVSS 9.8 · CriticalBuzz score 71.8KEV listed1 public exploit repository references

Buzz score

Why this CVE is surfacing

Buzz score total 71.8

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 28.3 · diversity 14.5 · KEV 25.0 · OTX 0.0 · PoC 4.0
Mention score
28.3
16 evidence mentions in the snapshot
Diversity score
14.5
5 sources across 2 categories
KEV score
25.0
Known exploited vulnerability present
OTX score
0.0
0 OTX pulses
PoC score
4.0
1 repos · best confidence 0.80
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
1
within the 30d window
Peak daily
1
highest bucket

Evidence

Source links by recency

Newest mentions first
16 source links · newest first
  • es secure remote access appliances which may have been chained for unauthenticated remote code execution. Key takeaways CVE-2026-15409 and CVE-2026-15410 are a pair of exploited vulnerabilities that may have been chained together to allow for code execution on SonicWall SMA1000 series appliances. Zero-day exploitation of these vulnerabilities has been

    vendorwww.tenable.comJul 15, 2026, 5:14 PM
  • The software update includes additional file checks and helps users remove the known rootkit deployed in a recent campaign.

    newswww.securityweek.comSep 24, 2025, 8:28 AM
  • SonicWall advises organizations to patch SMA 100 appliances and look for IoCs associated with Overstep malware attacks.

    newswww.securityweek.comJul 24, 2025, 10:18 AM
  • A threat actor that may be financially motivated is targeting SonicWall devices with a backdoor and user-mode rootkit.

    newswww.securityweek.comJul 16, 2025, 2:00 PM
  • A new report from Rapid7 says a ransomware gang like Cl0p would easily be able to afford a bevy of zero-day exploits for vulnerable enterprise software.

    newswww.securityweek.comAug 17, 2023, 3:30 PM
  • Top 12 vulnerabilities routinely exploited in 2022Help Net Security

    Cybersecurity agencies from member countries of the Five Eyes intelligence alliance have released a list of the top 12 vulnerabilities routinely exploited in 2022, plus 30 additional ones also “popular” with attackers. The top 12 “In 2022, malicious cyber actors exploited older software vulnerabilities more frequently than recently disclosed vulnerabilities and targeted unpatched, internet-facing systems. Proof of concept (PoC) code was publicly available for many of the software vulnerabilities or vulnerability chains likely facilitating exploitation … More →

    newswww.helpnetsecurity.comAug 4, 2023, 1:17 PM
  • North Korea-linked APT groups conduct ransomware attacks against healthcare and critical infrastructure facilities to fund its activities. Ransomware attacks on critical infrastructure conducted by North Korea-linked hacker groups are used by the government of Pyongyang to fund its malicious cyber operations, U.S. and South Korean agencies warn. US CISA published a Cybersecurity Advisory (CSA) to […]

    newssecurityaffairs.comFeb 10, 2023, 10:05 PM
  • The U.S. Cybersecurity and Infrastructure Security Agency (CISA) this week announced the addition of eight more vulnerabilities to the list of security flaws known to be exploited in malicious attacks.

    newswww.securityweek.comFeb 1, 2022, 11:12 AM
  • The US CISA added eight more flaws to its Known Exploited Vulnerabilities Catalog that are known to be used in attacks in the wild. The US Cybersecurity & Infrastructure Security Agency (CISA) has added eight more flaws to the Known Exploited Vulnerabilities Catalog. The ‘Known Exploited Vulnerabilities Catalog‘ is a list of known vulnerabilities that […]

    newssecurityaffairs.comJan 31, 2022, 9:05 PM
  • 31st January– Threat Intelligence ReportCheck Point Research

    For the latest discoveries in cyber research for the week of 31st January, please download our Threat Intelligence Bulletin. Top Attacks and Breaches Hacktivist group from Belarus called “Belarusian Cyber Partisans” has breached the computers systems of Belarusian Railways. Threat actors claim to have encrypted the network and are extorting the Belarusian government, asking for […]

    vendorresearch.checkpoint.comJan 31, 2022, 2:37 PM
  • Hackers have started targeting a recently patched vulnerability affecting SonicWall’s Secure Mobile Access (SMA) 100 series appliances, and while the attacks observed to date do not appear to have been successful, that could soon change.

    newswww.securityweek.comJan 26, 2022, 11:19 AM
  • Threat actors are actively exploiting a critical flaw (CVE-2021-20038) in SonicWall’s Secure Mobile Access (SMA) gateways addressed in December. Threat actors are actively exploiting a critical flaw, tracked as CVE-2021-20038, in SonicWall’s Secure Mobile Access (SMA) gateways addressed by the vendor in December. The vulnerability is an unauthenticated stack-based buffer overflow that was reported by […]

    newssecurityaffairs.comJan 25, 2022, 11:33 AM
  • Rapid7 today shared details on a series of vulnerabilities that SonicWall patched in the Secure Mobile Access (SMA) 100 series secure access gateway products last month.

    newswww.securityweek.comJan 11, 2022, 6:24 PM
  • SonicWall is urging organizations to address as soon as possible a series of recently patched vulnerabilities affecting its Secure Mobile Access (SMA) 100 series appliances.

    newswww.securityweek.comDec 9, 2021, 10:28 AM
  • SonicWall has fixed a handful of vulnerabilities affecting its SMA 100 series appliances and is urging organizations to implement the patches as soon as possible. Although there’s currently no evidence of these bugs being exploited in active attacks, threat actors have been known to target these appliances in the past by leveraging known and zero-day vulnerabilities. About the vulnerabilities The patched vulnerabilities, which were reported by Jake Baines of Rapid7 and Richard Warren of NCC … More →

    newswww.helpnetsecurity.comDec 9, 2021, 9:17 AM
  • SonicWall strongly urges customers using SMA 100 series appliances to install security patches that address multiple security flaws, some of them rated as critical. Security vendor SonicWall urges customers using SMA 100 series appliances to apply security patches that address multiple security vulnerabilities, some of which have been rated as critical. “SonicWall has verified and […]

    newssecurityaffairs.comDec 8, 2021, 8:08 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

1 repository references · best confidence 0.80 · max 0 stars

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