RC4 Biases in TLS/SSL Plaintext Recovery
CVE-2013-2566 describes weaknesses in the RC4 stream cipher when used in TLS and SSL. RC4 exhibits multiple statistically significant single-byte biases in its keystream. When the same or partially predictable plaintext is transmitted across a large number of encrypted sessions, a remote attacker observing the ciphertext can apply statistical analysis to recover portions of the plaintext. The issue is not a memory corruption flaw in a specific implementation; it is a cryptographic weakness in the RC4 algorithm as deployed in TLS/SSL cipher suites.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A legacy cryptography weakness involving RC4 encryption, highlighted as the most frequently detected CVE in the report’s network vulnerability findings.
An RC4-related TLS weakness referenced in test output showing no RC4 ciphers are enabled.
The version that knows your environment.
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.