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Vulnerability record · CVE-2020-19695 · published 4 April 2023

CVE-2020-19695: F5 njs classic buffer overflow vulnerability

F5 · Njs

Buffer Overflow found in Nginx NJS allows a remote attacker to execute arbitrary code via the njs_object_property parameter of the njs/njs_vm.c function.

9.8 CVSS 3.1 Critical EPSS 1.3% · top 30.0% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Buffer Overflow found in Nginx NJS allows a remote attacker to execute arbitrary code via the njs_object_property parameter of the njs/njs_vm.c function.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nginx/njs/issues/188 ExploitIssue TrackingPatch
https://github.com/nginx/njs/issues/188 ExploitIssue TrackingPatch

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-19692F5 njs classic buffer overflow vulnerabilityBuffer Overflow vulnerabilty found in Nginx NJS v.0feca92 allows a remote attacker to execute arbitrary code via the njs_module_read in the njs_modul…EPSS 1.3%9.8CVE-2022-43286F5 njs use after free vulnerabilityNginx NJS v0.7.2 was discovered to contain a heap-use-after-free bug caused by illegal memory copy in the function njs_json_parse_iterator_call at nj…EPSS 0.96%9.8CVE-2022-29379F5 njs out-of-bounds write vulnerabilityNginx NJS v0.7.3 was discovered to contain a stack overflow in the function njs_default_module_loader at /src/njs/src/njs_module.c. NOTE: multiple th…EPSS 1.8%9.8CVE-2022-27007F5 njs use after free vulnerabilitynginx njs 0.7.2 is affected suffers from Use-after-free in njs_function_frame_alloc() when it try to invoke from a restored frame saved with njs_func…EPSS 1.6%9.8CVE-2022-25139F5 njs use after free vulnerabilitynjs through 0.7.0, used in NGINX, was discovered to contain a heap use-after-free in njs_await_fulfilled.EPSS 1.6%9.8CVE-2021-46463F5 njs type confusion vulnerabilitynjs through 0.7.1, used in NGINX, was discovered to contain a control flow hijack caused by a Type Confusion vulnerability in njs_promise_perform_the…EPSS 1.7%9.8CVE-2019-13067F5 njs out-of-bounds read vulnerabilitynjs through 0.3.3, used in NGINX, has a buffer over-read in nxt_utf8_decode in nxt/nxt_utf8.c. This issue occurs after the fix for CVE-2019-12207 is …EPSS 1.6%9.8CVE-2019-12206F5 njs out-of-bounds write vulnerabilitynjs through 0.3.1, used in NGINX, has a heap-based buffer overflow in nxt_utf8_encode in nxt_utf8.c.EPSS 2.0%

Source: NIST National Vulnerability Database (record CVE-2020-19695), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.