No exploitation reportedFix available

CVE-2021-29047

Q: Is CVE-2021-29047 actively exploited?

Active exploitation of CVE-2021-29047 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-29047?

CVE-2021-29047 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2021-05-16
Fixed in7.3
WeaknessCWE-287

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

The SimpleCaptcha implementation in Liferay Portal 7.3.4, 7.3.5 and Liferay DXP 7.3 before fix pack 1 does not invalidate CAPTCHA answers after it is used, which allows remote attackers to repeatedly perform actions protected by a CAPTCHA challenge by reusing the same CAPTCHA answer.

Timeline

dates in UTC

2021-05-1616:15CVE publishedNVD

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-2021-29047?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-29047?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Liferay dxp

Branch	Affected	Fixed in	Source
7.3	< 7.3	7.3	NVD
7.3	= 7.3	no fix published	NVD

Liferay liferay portal

Branch	Affected	Fixed in	Source
7.3	= 7.3.4	no fix published	NVD
7.3	= 7.3.5	no fix published	NVD

release.dxp.bom

Branch	Affected	Fixed in	Source
7.3	< 7.3.10.fp1	7.3.10.fp1	OSV

1 more product in the sources.

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

Fix

Update Liferay dxp to 7.3

Advisories and patches

portal.liferay.devVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2021-05-16
Last Modified: 2026-07-09
NVD status: Modified

Frequently asked questions

What is CVE-2021-29047?

Is CVE-2021-29047 actively exploited?

Active exploitation of CVE-2021-29047 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-29047?

CVE-2021-29047 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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