Loading vulnerability…
CVE-2011-3658 is a critical remote code execution vulnerability in Mozilla Firefox, Thunderbird, and SeaMonkey, specifically affecting the nsSVGValue component. The vulnerability arises from an out-of-bounds memory access in the observer notification loop (nsSVGValue::NotifyObservers), which can be triggered when SVG elements are removed during DOMAttrModified event handling. Attackers can exploit this by manipulating SVG content to register observers that remove themselves during notification, leading to memory corruption and potential code execution. The issue was present in Firefox 8.0.1 and earlier, and was fixed in Firefox 9 and 3.6.28.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module (mozilla_nssvgvalue.rb) that exploits CVE-2011-3658, an out-of-bounds access vulnerability in Mozilla Firefox versions 7 and 8 (<= 8.0.1) on Windows XP. The exploit leverages a flaw in the nsSVGValue::NotifyObservers method, allowing an attacker to manipulate memory and execute arbitrary code via a crafted web page. The module sets up a malicious HTTP server that serves specially crafted HTML and JavaScript to the victim's browser. The JavaScript performs heap spraying and triggers the vulnerability, using a ROP chain to bypass DEP and execute shellcode. The exploit is weaponized, allowing the attacker to select and deliver a custom Metasploit payload (such as a reverse shell). The only fingerprintable endpoint is the use of the MOZCRT19.dll library for ROP gadgets. The repository is structured as a typical Metasploit exploit module, with all logic contained in a single Ruby file that generates and serves the exploit page.
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.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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.