{"id":"CVE-2017-6770","title":"Multiple Cisco Products OSPF LSA Manipulation Vulnerability (CVE-2017-6770)","summary":"Multiple Cisco products are affected by a vulnerability involving the Open Shortest Path First (OSPF) Routing Protocol Link State Advertisement (LSA) database. This vulnerability could allow an unauthenticated, remote attacker to take full…","severity":"medium","cvss":4.2,"cvssVector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C","cvssSource":"vendor","vendor":"Cisco","product":"IOS","affected":["ios 15.1(2)T","ios 12.0(25)SX10","ios 12.2(25)SW9","ios 12.0(6)","ios 12.2(31)XN2","ios 12.2(31)SB1a","ios 12.2(50)SG3","ios 12.3(14)YQ5","ios 12.2(25)EWA5","ios 12.2(18)SXD7b","ios 12.3(4)XD4","ios 12.3(11)YF2","ios 12.0(31)S5e","ios 12.2(2)XT2","ios 12.0(11)ST3","ios 12.0(32)S1b","ios 12.0(25)S1","ios 12.2(28)SB10","ios 12.4(21a)M1","ios 12.4(4)T8","ios 12.1(10)EV3","ios 12.0(16)S12","ios 12.2(20)S10","ios 12.0(31)S1d","ios 12.2(15)MC1c","ios 12.4(20)T1","ios 12.2(4)MB7","ios 12.3(8)YG7","ios 12.4(22)XR5","ios 12.2(55)EY","ios 12.0(30)S2","ios 12.4(15)XY4","ios 12.1(3a)XI9","ios 12.0(23)S5","ios 12.2(25)EWA1","ios 12.2(31)SB10c","ios 12.2(31)SB9b","ios 12.0(13)","ios 12.3(8)T9","ios 12.0(1)"],"published":"2017-07-27","updated":"2017-08-03","sourceUpdated":"2017-08-03T14:07:00+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170727-ospf","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170727-ospf"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.01693,"epssPercentile":0.76984,"ingestedAt":"2026-10-18T12:01:17.951Z","slug":"CVE-2017-6770","body":"## Overview\n\nMultiple Cisco products are affected by a vulnerability involving the Open Shortest Path First (OSPF) Routing Protocol Link State Advertisement (LSA) database. This vulnerability could allow an unauthenticated, remote attacker to take full control of the OSPF Autonomous System (AS) domain routing table, allowing the attacker to intercept or black-hole traffic.\r\n\r\nThe attacker could exploit this vulnerability by injecting crafted OSPF packets. Successful exploitation could cause the targeted router to flush its routing table and propagate the crafted OSPF LSA type 1 update throughout the OSPF AS domain.\r\n\r\nTo exploit this vulnerability, an attacker must accurately determine certain parameters within the LSA database on the target router. This vulnerability can only be triggered by sending crafted unicast or multicast OSPF LSA type 1 packets. No other LSA type packets can trigger this vulnerability.\r\n\r\nThe Fabric Shortest Path First (FSPF) protocol is not affected by this vulnerability.\r\n\r\nWorkarounds that address this vulnerability are available.\n\n## Vendor advisories\n\n- **cisco-sa-20170727-ospf** · Cisco · affected: IOS (3432 versions), Cisco Secure Firewall Adaptive Security Appliance (ASA) Software (337 versions), Cisco NX-OS Software (217 versions), Cisco IOS XE Software (203 versions) · updated 2017-08-03 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170727-ospf)\n\n**Multiple Cisco Products OSPF LSA Manipulation Vulnerability**. Released 2017-07-27, updated 2017-08-03.\n\nAffected:\n\n- IOS 15.1(2)T\n- IOS 12.0(25)SX10\n- IOS 12.2(25)SW9\n- IOS 12.0(6)\n- IOS 12.2(31)XN2\n- IOS 12.2(31)SB1a\n- IOS 12.2(50)SG3\n- IOS 12.3(14)YQ5\n- IOS 12.2(25)EWA5\n- IOS 12.2(18)SXD7b\n- IOS 12.3(4)XD4\n- IOS 12.3(11)YF2\n- IOS 12.0(31)S5e\n- IOS 12.2(2)XT2\n- IOS 12.0(11)ST3\n- IOS 12.0(32)S1b\n- IOS 12.0(25)S1\n- IOS 12.2(28)SB10\n- IOS 12.4(21a)M1\n- IOS 12.4(4)T8\n- IOS 12.1(10)EV3\n- IOS 12.0(16)S12\n- IOS 12.2(20)S10\n- IOS 12.0(31)S1d\n- IOS 12.2(15)MC1c\n- IOS 12.4(20)T1\n- IOS 12.2(4)MB7\n- IOS 12.3(8)YG7\n- IOS 12.4(22)XR5\n- IOS 12.2(55)EY\n- IOS 12.0(30)S2\n- IOS 12.4(15)XY4\n- IOS 12.1(3a)XI9\n- IOS 12.0(23)S5\n- IOS 12.2(25)EWA1\n- IOS 12.2(31)SB10c\n- IOS 12.2(31)SB9b\n- IOS 12.0(13)\n- IOS 12.3(8)T9\n- IOS 12.0(1)\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":23.1,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}