{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/exim/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Exim Internet Mailer (4.97 to 4.99.2)"],"_cs_severities":["critical"],"_cs_tags":["exim","vulnerability","rce"],"_cs_type":"threat","_cs_vendors":["Exim"],"content_html":"\u003cp\u003eOn May 12, 2026, Exim published a security advisory addressing a critical vulnerability within Exim Internet Mailer, specifically affecting versions 4.97 through 4.99.2. This vulnerability poses a significant risk to systems running these versions, potentially allowing unauthorized access or control. Administrators and users are strongly advised to review the Exim security advisory and apply the recommended updates promptly to mitigate potential exploitation. The Exim Internet Mailer is a widely used mail transfer agent (MTA) on Unix-like operating systems, making this a potentially widespread issue. Failure to address this vulnerability could lead to severe consequences, including data breaches, system compromise, and denial-of-service conditions.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Exim server running versions 4.97 to 4.99.2.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious email or network request designed to exploit the specific vulnerability.\u003c/li\u003e\n\u003cli\u003eThe malicious input is sent to the Exim server via SMTP or other supported protocols.\u003c/li\u003e\n\u003cli\u003eThe Exim process parses the malicious input, triggering the vulnerability.\u003c/li\u003e\n\u003cli\u003eThe vulnerability allows the attacker to execute arbitrary code on the server.\u003c/li\u003e\n\u003cli\u003eAttacker establishes a reverse shell or other form of remote access.\u003c/li\u003e\n\u003cli\u003eAttacker escalates privileges to gain root or system-level access.\u003c/li\u003e\n\u003cli\u003eAttacker installs malware, exfiltrates data, or performs other malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability can lead to complete compromise of the Exim server. Depending on the server\u0026rsquo;s role and network configuration, this could allow attackers to steal sensitive data, send spam, or pivot to other systems on the network. The vulnerability could impact a wide range of organizations using the affected Exim versions.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately update Exim Internet Mailer to a patched version as recommended by the Exim security advisory [https://www.exim.org/static/doc/security/EXIM-Security-2026-05-01.1/EXIM-Security-2026-05-01.1.txt].\u003c/li\u003e\n\u003cli\u003eMonitor Exim logs for suspicious activity that might indicate attempted exploitation of this vulnerability.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the impact of a successful compromise.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-13T15:04:34Z","date_published":"2026-05-13T15:04:34Z","id":"https://feed.craftedsignal.io/briefs/2026-05-exim-vuln/","summary":"A critical vulnerability exists in Exim Internet Mailer versions 4.97 to 4.99.2, requiring users and administrators to apply necessary updates.","title":"Exim Internet Mailer Vulnerability (Versions 4.97 to 4.99.2)","url":"https://feed.craftedsignal.io/briefs/2026-05-exim-vuln/"}],"language":"en","title":"CraftedSignal Threat Feed — Exim","version":"https://jsonfeed.org/version/1.1"}