CVE-2024-53920

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}, {"affectedData": [{"cpes": ["cpe:2.3:a:gnu:emacs:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "emacs", "vendor": "gnu", "versions": [{"status": "affected", "version": "30.0.92"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gnu:emacs:*:*:*:*:*:*:*:*", "matchCriteriaId": "96EC361D-1CD4-4AE3-AF24-F277BDA1182D", "versionEndExcluding": "30.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)"}, {"lang": "es", "value": "En elisp-mode.el de GNU Emacs hasta la versi\u00f3n 30.0.92, un usuario que elija invocar elisp-completion-at-point (para completar el c\u00f3digo) en c\u00f3digo fuente de Emacs Lisp que no sea de confianza puede desencadenar una expansi\u00f3n de macros de Lisp no segura que permita a los atacantes ejecutar c\u00f3digo arbitrario. (Esta expansi\u00f3n no segura tambi\u00e9n ocurre si un usuario elige habilitar el diagn\u00f3stico sobre la marcha de que byte compila c\u00f3digo fuente de Emacs Lisp que no es de confianza)."}], "id": "CVE-2024-53920", "lastModified": "2026-09-21T22:16:54.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-53920", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-12-02T16:55:56.437957Z", "version": "2.0.3"}}]}, "published": "2024-11-27T15:15:26.837", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html"}, {"source": "cve@mitre.org", "tags": ["Product"], "url": "https://git.savannah.gnu.org/cgit/emacs.git/tag/?h=emacs-30.0.92"}, {"source": "cve@mitre.org", "tags": ["Release Notes"], "url": "https://git.savannah.gnu.org/cgit/emacs.git/tree/ChangeLog.4"}, {"source": "cve@mitre.org", "tags": ["Product"], "url": "https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-30.1"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking"], "url": "https://news.ycombinator.com/item?id=42256409"}, {"source": "cve@mitre.org", "tags": ["Mailing List"], "url": "https://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg@mail.gmail.com/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/20/3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/08/20/7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/14/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/21/9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00033.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:4787", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "emacs-1:27.2-11.el9_5.2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-12T00:00:00Z"}, {"advisory": "RHSA-2025:9448", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "emacs-1:27.2-14.el9_6.2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-06-24T00:00:00Z"}, {"advisory": "RHSA-2025:4794", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "emacs-1:27.2-8.el9_2.3", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-05-12T00:00:00Z"}, {"advisory": "RHSA-2025:4793", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "emacs-1:27.2-10.el9_4.2", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-05-12T00:00:00Z"}], "bugzilla": {"description": "emacs: arbitrary code execution via Lisp macro expansion", "id": "2329161", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2329161"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-94", "details": ["In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)", "A flaw was found in Emacs. Viewing or editing an untrusted Emacs Lisp source code file can cause arbitrary code execution due to unsafe macro expansion when a user has configured elisp-completion-at-point for code completion or has enabled automatic error checking, such as Flymake or Flycheck."], "mitigation": {"lang": "en:us", "value": "Do not open or view untrusted Emacs Lisp source code files.\nDisabling auto-completion features and automatic error checking such as Flymake or Flycheck in untrusted Emacs Lisp source code files will mitigate this vulnerability."}, "name": "CVE-2024-53920", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2024-11-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-53920\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53920\nhttps://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html\nhttps://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg%40mail.gmail.com/"], "statement": "To exploit this flaw, an attacker needs to trick a user into opening an Emacs Lisp source code file with a crafted macro definition. Additionally, the user must have `elisp-completion-at-point` configured or automatic error checking enabled.\nFor these reasons, this flaw has been rated with a Moderate severity.\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-94: Improper Control of Generation of Code ('Code Injection') vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\nThe platform leverages a web application firewall (WAF) to filter and block malicious input before it reaches the application. It applies managed and custom rule sets to detect suspicious patterns such as embedded scripting functions and remote code execution attempts. By enforcing strict input validation and preventing unauthorized execution of user-supplied code, the WAF reduces the risk of exploitation. Additional protections like rate limiting and bot mitigation help prevent automated injection attacks, while integration with logging, monitoring, and threat detection systems enhances visibility and response capabilities. Through real-time monitoring and automated blocking, the WAF provides a strong layer of defense against code injection vulnerabilities, lowering the likelihood of successful exploitation.", "threat_severity": "Moderate"}

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