Medium 6.8Published Mar 4, 2008

CVE-2008-1147A certain pseudo-random number generator (PRNG) algorithm that uses XOR and 2-bit random hops (aka "Algorithm X2"), as used in OpenBSD 2.6 through 3.4, Mac OS X 10 through 10.5.1, FreeBSD 4.4 through…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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It affects cosmicperl directory_pro and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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A certain pseudo-random number generator (PRNG) algorithm that uses XOR and 2-bit random hops (aka "Algorithm X2"), as used in OpenBSD 2.6 through 3.4, Mac OS X 10 through 10.5.1, FreeBSD 4.4 through 7.0, and DragonFlyBSD 1.0 through 1.10.1, allows remote attackers to guess sensitive values such as IP fragmentation IDs by observing a sequence of previously generated values. NOTE: this issue can be leveraged for attacks such as injection into TCP packets and OS fingerprinting.

CVSS: 6.8 MEDIUM (v2.0, NVD)AV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

cosmicperl directory_pro cosmicperl:directory_pro	10.0.3	NVD
darwin darwin darwin:darwin	1.0; 9.1	NVD
navision financials_server navision:financials_server	3.0	NVD

References

References

http://seclists.org/bugtraq/2008/Feb/0052.html
http://seclists.org/bugtraq/2008/Feb/0063.html
http://secunia.com/advisories/28819	vendor-advisory
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10%3Bcontenttype=
http://www.securiteam.com/securityreviews/5PP0H0UNGW.html
http://www.securityfocus.com/archive/1/487658
http://www.securityfocus.com/bid/27647
http://www.trusteer.com/docs/OpenBSD_DNS_Cache_Poisoning_and_Multiple_OS_Predictable_IP_ID_Vulnerability.pdf
https://exchange.xforce.ibmcloud.com/vulnerabilities/40329
https://exchange.xforce.ibmcloud.com/vulnerabilities/41155

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.