{"id":"CVE-2020-13111","aliases":["EUVD-2020-5387","GHSA-v99v-qgch-h5q5"],"status":"published","title":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode...","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01435,"percentile":0.73327,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119","CWE-20","CWE-787"],"published":"2020-05-16T14:50:16Z","modified":"2026-06-17T02:52:38Z","products":[{"vendor":"naviserver_project","product":"naviserver"}],"references":[{"url":"https://sourceforge.net/p/naviserver/bugs/89/","tags":["x_refsource_MISC","x_transferred","Permissions Required","Third Party Advisory","report"]},{"url":"https://bitbucket.org/naviserver/naviserver/commits/a5c3079f1d8996d5f34c9384a440acf3519ca3bb","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-13111"},{"url":"https://github.com/advisories/GHSA-v99v-qgch-h5q5"}],"sources":{"cve":[{"id":"CVE-2020-13111","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","status":"published","published":"2020-05-16T14:50:16Z","modified":"2024-08-04T12:11:19.038Z","updated_at":"2026-11-02T14:35:53.868619Z"}],"euvd":[{"id":"EUVD-2020-5387","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","status":"published","published":"2020-05-16T14:50:16Z","modified":"2024-08-04T12:11:19Z","updated_at":"2026-11-03T03:07:38.81332Z"}],"ghsa":[{"id":"GHSA-v99v-qgch-h5q5","title":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode...","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","status":"published","published":"2022-05-24T17:18:00Z","modified":"2023-01-29T05:02:41Z","cwes":["CWE-119"],"updated_at":"2026-11-02T14:45:09.006349Z"}],"nvd":[{"id":"CVE-2020-13111","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","status":"published","published":"2020-05-16T15:15:11.377Z","modified":"2026-06-17T02:52:38.447Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20","CWE-787"],"updated_at":"2026-11-02T14:06:00.784809Z"}],"osv":[{"id":"CVE-2020-13111","description":"NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.","status":"published","published":"2020-05-16T15:15:11.377Z","modified":"2026-04-11T17:54:08.172167Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:14.034736Z"}]}}