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HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the 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HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13938.json","reference_id":"","reference_type":"","scores":[{"value":"6.2","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13938.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-13938","reference_id":"","reference_type":"","scores":[{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21778","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21808","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21906","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21866","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21943","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21997","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21761","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21839","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00071","scoring_system":"epss","scoring_elements":"0.21894","published_at":"2026-04-09T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-13938"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1970006","reference_id":"1970006","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1970006"},{"reference_url":"https://security.archlinux.org/AVG-2054","reference_id":"AVG-2054","reference_type":"","scores":[{"value":"Medium","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlinux.org/AVG-2054"},{"reference_url":"https://httpd.apache.org/security/json/CVE-2020-13938.json","reference_id":"CVE-2020-13938","reference_type":"","scores":[{"value":"moderate","scoring_system":"apache_httpd","scoring_elements":""}],"url":"https://httpd.apache.org/security/json/CVE-2020-13938.json"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/560?format=json","purl":"pkg:apache/httpd@2.4.48","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-9u53-b79b-cfgd"},{"vulnerability":"VCID-db6k-j9mj-e7hy"},{"vulnerability":"VCID-mtg7-8556-kbgd"},{"vulnerability":"VCID-rdtq-8ng5-53fn"},{"vulnerability":"VCID-wrw6-uzz4-rkfb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apache/httpd@2.4.48"}],"aliases":["CVE-2020-13938"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-91u7-vh6n-v7fm"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/3810?format=json","vulnerability_id":"VCID-9ych-ybpr-j3h6","summary":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of 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