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CVE-2015-2808, known as Bar Mitzvah, is a cryptographic weakness in RC4 when negotiated by TLS or SSL. RC4 initialization does not adequately combine state data and key data, producing an Invariance Weakness that can bias the initial bytes of a keystream for certain keys. An attacker who captures sufficient qualifying encrypted traffic can apply statistical and brute-force analysis involving least-significant-bit values to recover portions of plaintext at the beginning of protected streams.
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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.
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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An RC4-related TLS weakness referenced in test output showing no RC4 ciphers are enabled.
Bar Mitzvah is an RC4 stream-cipher vulnerability in SSL/TLS affecting HP-UX Web Server Suite running Apache. HP states it can be remotely exploited to disclose information.
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.