CVE-2021-39293 [High] | Security Vulnerability in Go

CVE-2021-39293 is rated High Risk (67.6/100): CVSS High severity, with high exploitation likelihood (EPSS 6.93%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +6.89% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.04%	6.93%	+6.89%
2	2025-11-21	0.50%	0.04%	-0.46%
3	2025-11-18	—	0.50%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.04%

6.93%

+6.89%

2025-11-21

0.50%

0.04%

-0.46%

2025-11-18

—

0.50%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/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:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. 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.	3.9	3.6	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/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:L) Exploitation conditions are straightforward and predictable. 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.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/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:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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.

3.9

3.6

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/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:L): Exploitation conditions are straightforward and predictable.
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.

10.0

2.9

[email protected]

OS Trackers for CVE-2021-39293

vendor	priority	summary	link
`alpine`	high	CVE-2021-39293: 1 source package rows (go); 39 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 32.	https://security.alpinelinux.org/vuln/CVE-2021-39293
`debian`	not yet assigned	CVE-2021-39293 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-2021-39293
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2021-39293
`suse`	high	CVE-2021-39293 severity important: SUSE including 27 source package names (1.0.1-build4.16.1:go1.16-1.16.8-1.26.1, 1.16-13.3:go1.16-1.16.8-1.26.1, …), 63 product×package rows across 13 product lines (Container bci/golang, Container trento/trento-runner, … (13 product lines)): Fixed 63.	https://www.suse.com/security/cve/CVE-2021-39293/
`ubuntu`	medium	CVE-2021-39293 medium priority: Ubuntu including 6 source packages (golang-1.11, golang-1.15, golang-1.16, golang-1.17, golang-1.7, golang-1.8), 82 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 61, ignored 10, needs-triage 6, released 3, not-affected 2.	https://ubuntu.com/security/CVE-2021-39293

Affected software / configurations for CVE-2021-39293

Vendor	Product	Version	Raw CPE
golang	go	< 1.16.8	cpe:2.3:a:golang:go::::::::
golang	go	>= 1.17.0, < 1.17.1	cpe:2.3:a:golang:go::::::::
netapp	cloud_insights_telegraf	—	cpe:2.3:a:netapp:cloud_insights_telegraf:-:::::::*

References for CVE-2021-39293

URL	Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
https://groups.google.com/g/golang-announce/c/dx9d7IOseHw	Issue Tracking Release Notes Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00021.html
https://security.netapp.com/advisory/ntap-20220217-0009/	Third Party Advisory

URL

CVE-2021-39293

Exploit prediction scoring system (EPSS) score for CVE-2021-39293

Common vulnerability scoring system (CVSS) metrics for CVE-2021-39293

Weakness enumeration for CVE-2021-39293

OS Trackers for CVE-2021-39293

Affected software / configurations for CVE-2021-39293

References for CVE-2021-39293