Vulnerability Details : CVE-2012-2663
extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets. NOTE: the CVE-2012-6638 fix makes this issue less relevant.
Exploit prediction scoring system (EPSS) score for CVE-2012-2663
Probability of exploitation activity in the next 30 days: 0.48%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 73 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2012-2663
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST |
References for CVE-2012-2663
-
http://www.spinics.net/lists/netfilter-devel/msg21248.html
Linux Netfilter Devel — Re: `iptables -m tcp --syn` doesn't do what the man saysPatch;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=826702
826702 – (CVE-2012-2663) CVE-2012-2663 iptables: --syn flag bypassIssue Tracking;Mitigation;Patch;Third Party Advisory
Products affected by CVE-2012-2663
- cpe:2.3:a:netfilter:iptables:*:*:*:*:*:*:*:*