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CVE-2020-5135 is a critical stack-based buffer overflow in SonicWall SonicOS affecting the HTTP/HTTPS service used for device management and SSL VPN remote access. The flaw affects SonicOS Gen 6, SonicOSv, and early Gen 7 releases, including versions identified as SonicOS 6.0.5.3 and earlier, 6.5.1.11/6.5.1.12 and earlier affected builds, 6.5.4.7 and earlier affected builds, SonicOSv 6.5.4.x and earlier affected builds, and SonicOS 7.0.0.0. A remote attacker can trigger the vulnerability by sending a crafted malicious request to the firewall. Available reporting states that the bug can corrupt stack memory and divert execution flow, causing a persistent denial-of-service condition and indicating that arbitrary code execution is likely feasible with additional exploit development.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical stack-based buffer overflow vulnerability in the SonicWall VPN Portal discussed by Conti members while seeking a working scanner and SonicWall appliances.
A SonicWall VPN vulnerability patched in October 2020 that the article says remains heavily abused by ransomware groups.
A critical buffer overflow in SonicWall SonicOS HTTP/HTTPS management and SSL VPN services that can be exploited remotely to cause persistent denial of service and is likely exploitable for remote code execution via stack corruption.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.