Which products and versions are affected by CVE-2020-15227?

Affected: Application (Nette) versions >= 2.0.0, = 2.1.0, among others. The full list is in the CVE brief.

Is CVE-2020-15227 being exploited in the wild?

It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 12, 2020.

Is CVE-2020-15227 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2020-15227?

No public exploit code is known.

Is there a fix for CVE-2020-15227?

Fixed versions are available, including Application 2.0.19, nette/application 2.0.19, nette/application 2.1.13.

How urgently should CVE-2020-15227 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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On CISA KEVCritical

CVE-2020-15227Application Code Injection

Potential Remote Code Execution vulnerability

Published Oct 2, 2020 · Updated Oct 20, 2026 · Also known as DEBIAN-CVE-2020-15227, DLA-2617-1, GHSA-8gv3-3j7f-wg94, UBUNTU-CVE-2020-15227, USN-5983-1

Key Facts

Patch immediately

CVE-2020-15227 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Application (Nette), Debian Linux, nette/application (composer) and 1 more product.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 12, 2020. No public exploit code is known.
EPSS estimates a 34% probability of exploitation in the next 30 days.
Fixed versions are available, including Application 2.0.19, nette/application 2.0.19, nette/application 2.1.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Scores

CVSS v3.1

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

34%

Higher than 98.4% of all scored CVEs

Exploit maturity

Exploited (KEV)

ATLAS score

58/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Oct 12, 2020

10 days after publication

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Exploited (KEV)

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

Description

Nette versions before 2.0.19, 2.1.13, 2.2.10, 2.3.14, 2.4.16, 3.0.6 are vulnerable to an code injection attack by passing specially formed parameters to URL that may possibly leading to RCE. Nette is a PHP/Composer MVC Framework.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CIRCL KEV	Oct 12, 2020	n/a	Not reported
Industry KEV feed	Oct 12, 2020	n/a	Not reported

Affected Products

9 affected entries in total

Product	Affected versions	Fixed in
ApplicationNette	>= 2.0.0, < 2.0.19	2.0.19
Debian LinuxDebian	9.0	n/a
nette/applicationcomposer	>= 2.1.0	2.1.13
php-nettedebian	See advisory	2.4-20160731-1+deb9u1

Patched Releases

Application

2.0.19

nette/application

2.0.19, 2.1.13, 2.2.10, 2.3.14, 2.4.16, 3.0.6

php-nette

2.3.8-1ubuntu1+esm1, 2.4-20160731-1+deb9u1, 2.4-20160731-1ubuntu0.1

Timeline

Publicly disclosed
Oct 2, 2020
Added to CIRCL KEV
Oct 12, 2020
Added to Industry KEV feed
Oct 12, 2020
Last updated
Oct 20, 2026

Weakness Type

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94 Improper Control of Generation of Code ('Code Injection')

References

15 more references in the full CVE brief

FAQ

Common Questions.

Nette versions before 2.0.19, 2.1.13, 2.2.10, 2.3.14, 2.4.16, 3.0.6 are vulnerable to an code injection attack by passing specially formed parameters to URL that may possibly leading to RCE.
Affected: Application (Nette) versions >= 2.0.0, < 2.0.19; Debian Linux versions 9.0; nette/application (composer) versions >= 2.1.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 12, 2020.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Application 2.0.19, nette/application 2.0.19, nette/application 2.1.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2020-15227 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.