{"id":"CVE-2026-20122","kind":"vulnerability","aliases":["CVE-2026-20122"],"related":[],"title":"A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to…","description":"Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.\n\nCISA required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.","summary":"Cisco Catalyst SD-WAN Manager has an incorrect use of privileged APIs flaw where improper file handling on the API lets an attacker upload a malicious file. A successful exploit lets the attacker overwrite arbitrary files and gain vmanage user privileges.","severity":"high","cvss":5.4,"epss":null,"exploited":true,"exploited_at":"2026-04-20T00:00:00+00:00","products":[{"name":"Cisco Catalyst SD-WAN Manger","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"cisco catalyst sd-wan manager","fixed":["20.9.8.2"],"affected":"< 20.9.8.2","ecosystem":"vendor"},{"name":"cisco catalyst sd-wan manager","fixed":["20.12.5.3"],"affected":">= 20.10, < 20.12.5.3","ecosystem":"vendor"},{"name":"cisco catalyst sd-wan manager","fixed":["20.15.4.2"],"affected":">= 20.13, < 20.15.4.2","ecosystem":"vendor"},{"name":"cisco catalyst sd-wan manager","fixed":["20.18.2.1"],"affected":">= 20.16, < 20.18.2.1","ecosystem":"vendor"},{"name":"cisco catalyst sd-wan manager","fixed":[],"affected":"= 20.12.6","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["catalyst-sd-wan-manager","cisco","exploited","infrastructure","sd-wan"],"not_affected_if":["unknown"],"how_to_check":"Follow CISA's Emergency Directive 26-03 and 'Hunt & Hardening Guidance for Cisco SD-WAN Devices' referenced in the CISA notice.","fix":"Follow CISA's Emergency Directive 26-03 mitigation guidance for Cisco SD-WAN devices; unknown fixed version in the sources.","status":"open","published_at":"2026-02-25T17:25:28+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:47+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:38:47Z","model":"claude-haiku-5-5","output":{"fix":"Follow CISA's Emergency Directive 26-03 mitigation guidance for Cisco SD-WAN devices; unknown fixed version in the sources.","reach":"unknown","summary":"Cisco Catalyst SD-WAN Manager has an incorrect use of privileged APIs flaw where improper file handling on the API lets an attacker upload a malicious file. A successful exploit lets the attacker overwrite arbitrary files and gain vmanage user privileges.","category":"infrastructure","who_cares":["cisco","sd-wan","catalyst-sd-wan-manager"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker overwrites system files and gains vmanage user privileges on the manager","analyst_note":"Sources lack affected versions, fixed versions and reach; check CISA Emergency Directive 26-03 and the Cisco advisory for CVE-2026-20122.","how_to_check":"Follow CISA's Emergency Directive 26-03 and 'Hunt & Hardening Guidance for Cisco SD-WAN Devices' referenced in the CISA notice.\nunknown\nunknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000504,"input_tokens":2747,"output_tokens":459,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':236C '-03':207C '-20122':21A,24A '-2026':20A,23A '22':235C '26':206C 'action':179C 'adher':181C,230C 'affect':139C,170C 'allow':14A,161C 'api':5A,84B,92B,126C,135C 'applic':233C 'arbitrari':107B,166C 'assess':187C 'associ':192C 'attack':18A,95B,105B,142C,163C 'authent':16A 'avail':251C 'bod':234C 'catalyst':8A,26A,32A,38A,44A,50A,56A,62B,73B,115C 'catalyst-sd-wan-manag':61B 'cisa':177C,183C,202C,214C 'cisco':7A,25A,31A,37A,43A,49A,55A,66B,72B,114C,194C,220C 'cloud':239C 'contain':120C 'could':13A,143C,160C 'cve':19A,22A 'devic':198C,224C 'direct':205C 'discontinu':242C 'due':128C 'emerg':204C 'exploit':67B,102B,144C,159C 'exposur':188C 'file':88B,99B,108B,131C,151C,155C,167C 'flaw':85B 'gain':110B,173C 'guidanc':218C,237C 'guidelin':185C 'handl':89B,132C 'harden':217C 'hunt':216C 'improp':87B,130C 'incorrect':80B,122C 'infrastructur':68B 'interfac':136C 'let':93B,103B 'list':209C,226C 'local':154C 'malici':98B,150C 'manag':12A,65B,77B,119C 'manager':36A,42A,48A,54A,60A 'manger':30A 'mitig':190C,248C 'note':212C,229C 'outlin':200C 'overwrit':106B,165C 'pleas':180C 'privileg':83B,113B,125C,176C 'product':246C 'remot':17A 'requir':178C 'risk':191C 'sd':10A,28A,34A,40A,46A,52A,58A,63B,70B,75B,117C,196C,222C 'sd-wan':9A,27A,33A,39A,45A,51A,57A,69B,74B,116C,195C,221C 'servic':240C 'success':101B,158C 'system':140C,156C,171C 'upload':96B,148C 'url':208C,225C 'use':81B,123C,243C 'user':112B,175C 'vmanag':111B,174C 'vulner':2A,127C,146C 'wan':11A,29A,35A,41A,47A,53A,59A,64B,71B,76B,118C,197C,223C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-02-25T17:25:28+00:00","kev":{"dateAdded":"2026-04-20","dueDate":"2026-04-23","requiredAction":"Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-20122","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20122","severity":null,"published_at":"2026-04-20T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T17:39:55+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-20122","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20122","severity":null,"published_at":"2026-02-25T17:25:28+00:00","modified_at":"2026-06-17T10:17:09+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}