CVE-2020-15586

Go before 1.13.13 and 1.14.x before 1.14.5 has a data race in some net/http servers, as demonstrated by the httputil.ReverseProxy Handler, because it reads a request body and writes a response at the same time.

Published: 2020-07-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-15586 is rated Moderate Risk (55.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.89%). EPSS rose +2.28% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2020-15586

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 0.61% 2.89% +2.28%
2 2026-02-26 0.46% 0.61% +0.16%
3 2026-02-21 — 0.46% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-15586

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-15586

OS Trackers for CVE-2020-15586

vendor priority summary link
alpine medium CVE-2020-15586: 1 source package rows (go); 19 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 12. https://security.alpinelinux.org/vuln/CVE-2020-15586
debian not yet assigned CVE-2020-15586 not yet assigned priority: Debian including 1 source packages (golang-1.15), 1 status rows across 1 suites (bullseye): resolved 1. https://security-tracker.debian.org/tracker/CVE-2020-15586
redhat medium — https://access.redhat.com/security/cve/CVE-2020-15586
suse high CVE-2020-15586 severity important: SUSE including 33 source package names (delve-1.3.2-3.module+el8.2.0+5581+896cb53e, go-toolset-1.13.15-1.module+el8.2.0+7662+fa98b974, …), 67 product×package rows across 15 product lines (SUSE Liberty Linux 8, SUSE Linux Enterprise Module for Development Tools 15 SP1, … (15 product lines)): Fixed 67. https://www.suse.com/security/cve/CVE-2020-15586/
ubuntu low CVE-2020-15586 low priority: Ubuntu including 8 source packages (golang, golang-1.10, …), 128 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 99, needs-triage 10, needed 8, ignored 5, not-affected 3, released 3. https://ubuntu.com/security/CVE-2020-15586

Affected software / configurations for CVE-2020-15586

Vendor Product Version Raw CPE
golang go < 1.13.13 cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
golang go >= 1.14.0, < 1.14.5 cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
cloudfoundry cf-deployment < 13.7.0 cpe:2.3:a:cloudfoundry:cf-deployment:*:*:*:*:*:*:*:*
cloudfoundry routing-release < 0.203.0 cpe:2.3:a:cloudfoundry:routing-release:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
opensuse leap 15.2 cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

References for CVE-2020-15586

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00082.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00029.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00030.html Mailing List Third Party Advisory
https://groups.google.com/forum/#%21topic/golang-announce/XZNfaiwgt2w
https://groups.google.com/forum/#%21topic/golang-announce/f2c5bqrGH_g
https://lists.debian.org/debian-lts-announce/2020/11/msg00037.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00038.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OCR6LAKCVKL55KJQPPBBWVQGOP7RL2RW/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WIRVUHD7TJIT7JJ33FKHIVTHPYABYPHR/
https://security.netapp.com/advisory/ntap-20200731-0005/ Third Party Advisory
https://www.cloudfoundry.org/blog/cve-2020-15586/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4848 Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html Patch Third Party Advisory
cvelogic Threat Intelligence