CVE-2020-36851

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.83% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 54.8% of scored records. A rank, not a probability.

NVD base score

9.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-09-25 14:45Z11 MO AGO

Last updated

2026-06-23 16:13Z2 MO AGO

Reserved

2025-09-25

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.5)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base
• CWE-942Permissive Cross-domain Security Policy with Untrusted DomainsVariant

Data version

5.2

Document digest

41cd0f9a41a213c9ad373c2f7dab9d67bb7949b0c45988fdbdeef322bcf270c7

• github.comhttps://github.com/Rob--W/cors-anywhere/issues/152issue-tracking
• github.comhttps://github.com/Rob--W/cors-anywhere/issues/78issue-tracking
• www.certik.comhttps://www.certik.com/resources/blog/cors-anywhere-dangers-of-misconfigured-third-party-softwaretechnical-description
• www.vulncheck.comhttps://www.vulncheck.com/advisories/rob-w-cors-anywhere-misconfigured-cors-proxy-allows-ssrfthird-party-advisory
• github.comhttps://github.com/SocketDev/security-research/security/advisories/GHSA-9wmg-93pw-fc3gvendor-advisory
• github.comhttps://github.com/Rob--W/cors-anywhere/issues/521issue-tracking