CVE-2020-8515

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 1.000 · 100 %ileexploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 4 exploits · PoC

Likely / severe?

100.0% (100th) EPSS

CVSS 10 · high

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

added 2021-11-03remediate by 2022-05-03

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-23

Multiple DrayTek Vigor Routers Web Management Page Vulnerability

DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 9.8–10

v2.010highAV:N/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 10 · impact 10

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-78USprimaryCWE-78US

ATT&CK techniques

ATT&CK techniques this enables or maps to.

exploits (4)

Public proof-of-concept and weaponised exploit code.

EDB-48268Multiple DrayTek Products - Pre-authentication Remote Root Code ExecutionPoC · exploit_db
darrenmartyn/CVE-2020-8515Draytek CVE-2020-8515 PoCPoC · poc_in_github
imjdl/CVE-2020-8515-PoCCVE-2020-8515-PoCPoC · poc_in_github
truerandom/nmap_draytek_rcenmap script to detect CVE-2020-8515 on Draytek DevicesPoC · poc_in_github

affected products (9)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
DrayTek Vigor2960≤ 1.5.1fstec_bduRU
DrayTek Vigor300B≤ 1.5.1fstec_bduRU
DrayTek Vigor3900≤ 1.5.1fstec_bduRU
draytek vigor2960 firmware= 1.3.1nvdUScpe:2.3:o:draytek:vigor2960_firmware:*:*:*:*:*:*:*:*
draytek vigor300b firmware= 1.3.3nvdUScpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:*
draytek vigor300b firmware= 1.4.2.1nvdUScpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:*
draytek vigor300b firmware= 1.4.4nvdUScpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:*
draytek vigor3900 firmware= 1.4.4nvdUScpe:2.3:o:draytek:vigor3900_firmware:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2020-02-01modified 2026-06-17

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references (13)

External citations — patches, advisories, analysis.

scry

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