CVE-2021-31879 [Medium] | Security Vulnerability in Wget

CVE-2021-31879 is rated Low Risk (37.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.15%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-19	0.11%	0.15%	+0.04%
2	2025-11-21	0.20%	0.11%	-0.08%
3	2025-11-18	—	0.20%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-19

0.11%

0.15%

+0.04%

2025-11-21

0.20%

0.11%

-0.08%

2025-11-18

—

0.20%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/A:N` 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:N) No availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:N 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:N): No availability impact.

8.6

4.9

[email protected]

OS Trackers for CVE-2021-31879

vendor	priority	summary	link
`alpine`	medium	CVE-2021-31879: 1 source package rows (wget); 28 state rows across 8 repos (3.10-main, 3.11-main, 3.12-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 28.	https://security.alpinelinux.org/vuln/CVE-2021-31879
`debian`	not yet assigned	CVE-2021-31879 not yet assigned priority: Debian including 1 source packages (wget), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5.	https://security-tracker.debian.org/tracker/CVE-2021-31879
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2021-31879
`suse`	medium	CVE-2021-31879 severity moderate: SUSE including 239 source package names (0.3.2-1.2:wget-1.20.3-150600.19.12.1, 2.5.0-2.1:wget-1.20.3-150600.19.12.1, …), 472 product×package rows across 240 product lines (Container containers/lmcache-vllm-openai, Container containers/pytorch, … (240 product lines)): Known Affected 221, Fixed 217, Will Not Fix 34.	https://www.suse.com/security/cve/CVE-2021-31879/
`ubuntu`	medium	CVE-2021-31879 medium priority: Ubuntu including 1 source packages (wget), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 8, deferred 7, needed 1.	https://ubuntu.com/security/CVE-2021-31879

Affected software / configurations for CVE-2021-31879

Vendor	Product	Version	Raw CPE
gnu	wget	<= 1.21.1	cpe:2.3:a:gnu:wget::::::::
broadcom	brocade_fabric_operating_system_firmware	—	cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:::::::*
netapp	cloud_backup	—	cpe:2.3:a:netapp:cloud_backup:-:::::::*
netapp	ontap_select_deploy_administration_utility	—	cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:::::::*
netapp	a250_firmware	—	cpe:2.3:o:netapp:a250_firmware:-:::::::*
netapp	500f_firmware	—	cpe:2.3:o:netapp:500f_firmware:-:::::::*

References for CVE-2021-31879

URL	Tags
https://mail.gnu.org/archive/html/bug-wget/2021-02/msg00002.html	Mailing List Vendor Advisory
https://security.netapp.com/advisory/ntap-20210618-0002/	Third Party Advisory

URL

CVE-2021-31879

Exploit prediction scoring system (EPSS) score for CVE-2021-31879

Common vulnerability scoring system (CVSS) metrics for CVE-2021-31879

Weakness enumeration for CVE-2021-31879

OS Trackers for CVE-2021-31879

Affected software / configurations for CVE-2021-31879

References for CVE-2021-31879