ET EXPLOIT Possible CVE-2015-7547 Large Response to A/AAAA query

Query · suricata

flow:established,from_server;
flowbits:isset,ET.CVE20157547.primer;
content:!"|04|eqtv|02|io|00|";
byte_test:2,>,2048,0;
byte_test:1,&,128,4;
byte_test:1,!&,64,4;
byte_test:1,!&,32,4;
byte_test:1,!&,16,4;
byte_test:1,!&,8,4;
content:"|00 01|"; offset:6; depth:2;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET EXPLOIT Possible CVE-2015-7547 Large Response to A/AAAA query · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp any 53 -> $HOME_NET any (
    msg:"ET EXPLOIT Possible CVE-2015-7547 Large Response to A/AAAA query";
    flow:established,from_server;
    flowbits:isset,ET.CVE20157547.primer;
    content:!"|04|eqtv|02|io|00|";
    byte_test:2,>,2048,0;
    byte_test:1,&,128,4;
    byte_test:1,!&,64,4;
    byte_test:1,!&,32,4;
    byte_test:1,!&,16,4;
    byte_test:1,!&,8,4;
    content:"|00 01|"; offset:6; depth:2;
    reference:cve,2015-7547;
    classtype:attempted-user;
    sid:2022547; rev:2;
    metadata:created_at 2016_02_18, cve CVE_2015_7547, confidence Medium, signature_severity Major, updated_at 2026_07_15;
)

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