{"id":"CVE-2020-11899","kind":"vulnerability","aliases":["CVE-2020-11899"],"related":[],"title":"Treck TCP/IP stack IPv6: Treck TCP/IP stack Out-of-Bounds Read Vulnerability","description":"The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability.\n\nCISA required action: Apply updates per vendor instructions.","summary":"The Treck TCP/IP stack has an IPv6 out-of-bounds read flaw that lets a crafted packet make the device read memory past a buffer. CISA lists it as actively exploited, so attackers can likely leak memory contents or crash the device.","severity":"medium","cvss":5.4,"epss":0.1842,"exploited":true,"exploited_at":"2022-03-03T00:00:00+00:00","products":[{"name":"Treck TCP/IP stack IPv6","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["embedded","exploited","infrastructure","iot","ipv6","treck-tcp-ip"],"not_affected_if":["ipv6-disabled","no-treck-stack"],"how_to_check":null,"fix":"Apply the vendor's updates per CISA guidance; the sources do not name the fixed version.","status":"open","published_at":"2020-06-17T11:15:10+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:24:29+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-23T21:24:29Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor's updates per CISA guidance; the sources do not name the fixed version.","reach":"network","impact":"medium","summary":"The Treck TCP/IP stack has an IPv6 out-of-bounds read flaw that lets a crafted packet make the device read memory past a buffer. CISA lists it as actively exploited, so attackers can likely leak memory contents or crash the device.","category":"infrastructure","who_cares":["embedded","iot","treck-tcp-ip","ipv6"],"confidence":0.5,"needs_auth":"no","worst_case":"Device memory leaks or crashes from a crafted IPv6 packet","analyst_note":"Find the affected device list and vendor advisory linked from the CISA KEV entry (https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-11899) to fill in fixed versions and how to check exposure.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["ipv6-disabled","no-treck-stack"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000487,"input_tokens":2833,"output_tokens":408,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-11899':16A,19A '-2020':15A,18A 'action':91C 'activ':63B 'appli':92C 'attack':66B 'bound':11A,43B,86C 'buffer':58B 'cisa':59B,89C 'contain':80C 'content':71B 'craft':49B 'crash':73B 'cve':14A,17A 'devic':53B,75B 'embed':24B 'exploit':25B,64B 'flaw':45B 'infrastructur':26B 'instruct':96C 'iot':27B 'ip':32B 'ipv6':4A,23A,28B,39B,82C 'leak':69B 'let':47B 'like':68B 'list':60B 'make':51B 'memori':55B,70B 'out-of-bound':8A,40B,83C 'packet':50B 'past':56B 'per':94C 'read':12A,44B,54B,87C 'requir':90C 'stack':3A,7A,22A,36B,79C 'tcp':31B 'tcp/ip':2A,6A,21A,35B,78C 'treck':1A,5A,20A,30B,34B,77C 'treck-tcp-ip':29B 'updat':93C 'vendor':95C 'vulner':13A,88C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-06-17T11:15:10+00:00","kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-17","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-11899","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-11899","severity":null,"published_at":"2022-03-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T13:39:32+00:00","note":null},{"source":"epss","external_id":"CVE-2020-11899","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-11899","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2020-11899","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11899","severity":null,"published_at":"2020-06-17T11:15:10+00:00","modified_at":"2026-06-17T02:51:00+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}