CVE-2020-8265

Exp

Node.js versions before 10.23.1, 12.20.1, 14.15.4, 15.5.1 are vulnerable to a use-after-free bug in its TLS implementation. When writing to a TLS enabled socket, node::StreamBase::Write calls node::TLSWrap::DoWrite with a freshly allocated WriteWrap object as first argument. If the DoWrite method does not return an error, this object is passed back to the caller as part of a StreamWriteResult structure. This may be exploited to corrupt memory leading to a Denial of Service or potentially other exploits.

Published: 2021-01-06 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8265 is rated High Exploit Risk (85.5/100): CVSS High severity, with high exploitation likelihood (EPSS 9.01%, 95th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +8.25% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-8265

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-8265

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.76% 9.01% +8.25%
2 2026-03-18 1.02% 0.76% -0.27%
3 2026-03-04 — 1.02% —

Full EPSS history (51 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8265

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2020-8265

OS Trackers for CVE-2020-8265

vendor priority summary link
alpine high CVE-2020-8265: 2 source package rows (nodejs, nodejs-current); 51 state rows across 16 repos (3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 16, open 35. https://security.alpinelinux.org/vuln/CVE-2020-8265
debian not yet assigned CVE-2020-8265 not yet assigned priority: Debian including 1 source packages (nodejs), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-8265
gentoo normal CVE-2020-8265: 1 GLSA(s) (202101-07), 1 atom(s) (net-libs/nodejs); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-8265
redhat medium — https://access.redhat.com/security/cve/CVE-2020-8265
suse high CVE-2020-8265 severity important: SUSE including 67 source package names (12:nodejs12-12.20.1-4.10.1, 12:npm12-12.20.1-4.10.1, …), 169 product×package rows across 25 product lines (Container bci/node, Container bci/nodejs, … (25 product lines)): Fixed 135, Will Not Fix 30, Known Not Affected 4. https://www.suse.com/security/cve/CVE-2020-8265/
ubuntu medium CVE-2020-8265 medium priority: Ubuntu including 1 source packages (nodejs), 12 status rows across 12 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, trusty, upstream, xenial): ignored 4, not-affected 4, released 3, needs-triage 1. https://ubuntu.com/security/CVE-2020-8265

Affected software / configurations for CVE-2020-8265

Vendor Product Version Raw CPE
nodejs node.js >= 10.0.0, < 10.23.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 12.0.0, < 12.20.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 14.0.0, < 14.15.4 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 15.0.0, < 15.5.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
oracle graalvm 19.3.4 cpe:2.3:a:oracle:graalvm:19.3.4:*:*:*:enterprise:*:*:*
oracle graalvm 20.3.0 cpe:2.3:a:oracle:graalvm:20.3.0:*:*:*:enterprise:*:*:*
siemens sinec_infrastructure_network_services < 1.0.1.1 cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*

References for CVE-2020-8265

URL Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch Third Party Advisory
https://hackerone.com/reports/988103 Exploit Issue Tracking Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/ Patch Vendor Advisory
https://security.gentoo.org/glsa/202101-07 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210212-0003/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4826 Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Third Party Advisory
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