Public proof of conceptFix available

CVE-2020-15148

Q: Is CVE-2020-15148 actively exploited?

Active exploitation of CVE-2020-15148 has not been confirmed. Its EPSS score was 77.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-15148?

CVE-2020-15148 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2020-09-15
Fixed in2.0.38
WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Yii 2 (yiisoft/yii2) before version 2.0.38 is vulnerable to remote code execution if the application calls `unserialize()` on arbitrary user input. This is fixed in version 2.0.38. A possible workaround without upgrading is available in the linked advisory.

Timeline

dates in UTC

2020-09-1519:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-15148?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-15148?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Yiiframework yii

Branch	Affected	Fixed in	Source
2.0	< 2.0.38	2.0.38	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Yiiframework yii to 2.0.38

Advisories and patches

github.comPatch
github.comMitigation

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedMaskhe/CVE-2020-15148-bypasses0xkami/cve-2020-15148

Sources

CNACVSS 3.18.9read 2026-10-23
NVDCVSS 3.110read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-502read 2026-10-23
FIRST EPSSEPSS score77.5 %read 2026-10-23
PoC-in-GitHubproof of concept2read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published: 2020-09-15
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-15148?

Is CVE-2020-15148 actively exploited?

Active exploitation of CVE-2020-15148 has not been confirmed. Its EPSS score was 77.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-15148?

CVE-2020-15148 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

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