{"id":"CVE-2008-1147","aliases":["EUVD-2008-1156","GHSA-7489-8f63-32p6"],"status":"published","title":"A certain pseudo-random number generator (PRNG) algorithm that uses XOR and 2-bit random hops ...","description":"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.","severity":{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01772,"percentile":0.78283,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2008-03-04T23:00:00Z","modified":"2026-06-16T22:51:05Z","products":[{"vendor":"cosmicperl","product":"directory_pro"},{"vendor":"darwin","product":"darwin"},{"vendor":"navision","product":"financials_server"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/41155","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://seclists.org/bugtraq/2008/Feb/0063.html","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://seclists.org/bugtraq/2008/Feb/0052.html","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/487658","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://secunia.com/advisories/28819","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://www.trusteer.com/docs/OpenBSD_DNS_Cache_Poisoning_and_Multiple_OS_Predictable_IP_ID_Vulnerability.pdf","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.securiteam.com/securityreviews/5PP0H0UNGW.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/40329","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10%3Bcontenttype=","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.securityfocus.com/bid/27647","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2008-1147"},{"url":"http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/ip_id.c?rev=1.10;contenttype="},{"url":"https://github.com/advisories/GHSA-7489-8f63-32p6"}],"sources":{"cve":[{"id":"CVE-2008-1147","description":"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.","status":"published","published":"2008-03-04T23:00:00Z","modified":"2024-08-07T08:08:57.697Z","updated_at":"2026-11-02T14:34:47.71012Z"}],"euvd":[{"id":"EUVD-2008-1156","description":"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.","status":"published","published":"2008-03-04T23:00:00Z","modified":"2024-08-07T08:08:57Z","updated_at":"2026-11-03T01:39:03.090998Z"}],"ghsa":[{"id":"GHSA-7489-8f63-32p6","title":"A certain pseudo-random number generator (PRNG) algorithm that uses XOR and 2-bit random hops ...","description":"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.","status":"published","published":"2022-05-01T23:37:13Z","modified":"2025-04-09T03:53:13Z","updated_at":"2026-11-02T15:00:56.572949Z"}],"nvd":[{"id":"CVE-2008-1147","description":"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.","status":"published","published":"2008-03-04T23:44:00Z","modified":"2026-06-16T22:51:05.4Z","cvss":[{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:01:25.307768Z"}]}}