{"id":"CVE-2022-41040","kind":"vulnerability","aliases":["CVE-2022-41040"],"related":[],"title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Microsoft Exchange Server allows for server-side request forgery. Dubbed \"ProxyNotShell,\" this vulnerability is chainable with CVE-2022-41082 which allows for remote code execution.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft Exchange Server has a server-side request forgery flaw, dubbed ProxyNotShell, that lets a remote attacker make the server send requests to internal systems. It is chainable with CVE-2022-41082, which allows remote code execution.","severity":"high","cvss":8.8,"epss":null,"exploited":true,"exploited_at":"2022-09-30T00:00:00+00:00","products":[{"name":"Microsoft Exchange Server","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft exchange server","fixed":[],"affected":"= 2013","ecosystem":"vendor"},{"name":"microsoft exchange server","fixed":[],"affected":"= 2016","ecosystem":"vendor"},{"name":"microsoft exchange server","fixed":[],"affected":"= 2019","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exchange-server","exploited","infrastructure","on-premises","ransomware","windows"],"not_affected_if":["exchange-online","microsoft-365"],"how_to_check":null,"fix":"Apply the Microsoft Exchange Server updates per vendor instructions (version not stated in sources).","status":"open","published_at":"2022-09-30T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:10:34+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:10:34Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft Exchange Server updates per vendor instructions (version not stated in sources).","reach":"internet","impact":"high","summary":"Microsoft Exchange Server has a server-side request forgery flaw, dubbed ProxyNotShell, that lets a remote attacker make the server send requests to internal systems. It is chainable with CVE-2022-41082, which allows remote code execution.","category":"infrastructure","who_cares":["exchange-server","on-premises","windows"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker reaches internal services and, chained with CVE-2022-41082, runs code on the server.","analyst_note":"Find affected and fixed Exchange build numbers and the Microsoft advisory for CVE-2022-41040 and CVE-2022-41082 (MSRC), and check whether the sources' exploited status and ransomware tag match CISA KEV.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["exchange-online","microsoft-365"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000482,"input_tokens":2823,"output_tokens":400,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2022':9A,12A,67B,92C '-41040':10A,13A '-41082':68B,93C 'action':102C 'allow':70B,77C,95C 'appli':103C 'attack':53B 'chainabl':64B,89C 'cisa':100C 'code':72B,98C 'cve':8A,11A,66B,91C 'dub':47B,84C 'elev':4A 'exchang':2A,27B,37B,75C 'exchange':15A,18A,21A,24A 'exchange-serv':26B 'execut':73B,99C 'exploit':29B 'flaw':46B 'forgeri':45B,83C 'infrastructur':30B 'instruct':107C 'intern':60B 'let':50B 'make':54B 'microsoft':1A,14A,17A,20A,23A,36B,74C 'on-premis':31B 'per':105C 'premis':33B 'privileg':6A 'proxynotshel':48B,85C 'ransomwar':34B 'remot':52B,71B,97C 'request':44B,58B,82C 'requir':101C 'send':57B 'server':3A,16A,19A,22A,25A,28B,38B,42B,56B,76C,80C 'server-sid':41B,79C 'side':43B,81C 'system':61B 'updat':104C 'vendor':106C 'vulner':7A,87C 'window':35B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2022-09-30T00:00:00+00:00","kev":{"dateAdded":"2022-09-30","dueDate":"2022-10-21","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2022-41040","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-41040","severity":null,"published_at":"2022-09-30T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T16:39:47+00:00","note":null},{"source":"nvd","external_id":"CVE-2022-41040","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-41040","severity":null,"published_at":"2022-10-03T01:15:08+00:00","modified_at":"2026-06-17T05:02:28+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+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"}