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VulnerabilityCVE-2018-20062Published 2018-12-11

CVE-2018-20062

criticalCISA KEVPublic exploit5 PoC reposNuclei template

As of 2025-10-21, CVE-2018-20062 is a CRITICAL-severity vulnerability, CVSS v3.1 9.8, EPSS 99.5% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), with a US federal remediation deadline of 2022-05-03. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2018-20062, most recently “TuxBot v3 Evolution: LLM-Assisted IoT Botnet Framework With a Broken Multi-CVE Exploit Chain”.

CVSS v3.1
9.8/10Critical
EPSS
99.5%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2022-05-03
Tracked threats
1Campaigns referencing it
Priority
9/10Threadlinqs triage score
Published
Updated 2025-10-21
CVSS v3.1 9.8 (CRITICAL) · EPSS 99.5% (higher than 99.9% of all scored CVEs) · Priority 9/10 · Published 2018-12-11

Last updated:

What is CVE-2018-20062?

An issue was discovered in NoneCms V1.3. thinkphp/library/think/App.php allows remote attackers to execute arbitrary PHP code via crafted use of the filter parameter, as demonstrated by the s=index/\think\Request/input&filter=phpinfo&data=1 query string.

Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. The identifier was first published 2878 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
99.5% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2021-11-03, federal remediation deadline 2022-05-03
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2018-12-11, last modified 2025-10-21

Is CVE-2018-20062 being exploited?

CISA added CVE-2018-20062 to the Known Exploited Vulnerabilities catalog on 2021-11-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-05-03 under BOD 22-01. Weaponised exploit code for CVE-2018-20062 is publicly available. 5 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2018/CVE-2018-20062.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

Affected products and versions

No affected-product or package list has been recorded for CVE-2018-20062 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

How to fix CVE-2018-20062

Because CVE-2018-20062 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-05-03. No vendor patch reference has been recorded for CVE-2018-20062 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

Threat activity tracking CVE-2018-20062

1 tracked threat in the Threadlinqs corpus references CVE-2018-20062, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on .

Other references