CVE-2021-25033

MEDIUMNVD 6.16.1—Elevated

6.1

The WordPress Newsletter Plugin WordPress plugin before 1.6.5 does not validate the to parameter before redirecting the user to its given value, leading to an open redirect issue

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 77.9%
KEV: Not listed

Published

February 14, 2022

Last Modified

November 21, 2024

References (4)

contact@wpscanhttps://plugins.trac.wordpress.org/changeset/2639592
contact@wpscanhttps://wpscan.com/vulnerability/c2d2384c-41b9-4aaf-b918-c1cfda58af5c
af854a3a-2127-422b-91ae-364da2661108https://plugins.trac.wordpress.org/changeset/2639592
af854a3a-2127-422b-91ae-364da2661108https://wpscan.com/vulnerability/c2d2384c-41b9-4aaf-b918-c1cfda58af5c

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-601URL Redirection to Untrusted Site (Open Redirect)

Data Freshness Timeline

(refreshed 11× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 03:06 UTCEG score recompute
2026-05-26 03:06 UTCGHSA enrichment
2026-05-23 23:25 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2021/CVE-2021-25033.yaml
First seen Jan 1, 2021
Noptin < 1.6.5 - Open Redirect
Open source ↗

Frequently asked(5)

What is CVE-2021-25033?

CVE-2021-25033 is a medium vulnerability published on February 14, 2022. The WordPress Newsletter Plugin WordPress plugin before 1.6.5 does not validate the to parameter before redirecting the user to its given value, leading to an open redirect issue

When was CVE-2021-25033 disclosed?

CVE-2021-25033 was first published in the National Vulnerability Database on February 14, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-25033 actively exploited?

CVE-2021-25033 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-25033?

CVE-2021-25033 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2021-25033?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-25033, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-25033

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-25033?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)