How severe is CVE-2025-8129?

CVE-2025-8129 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-8129 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-8129?

CVE-2025-8129 primarily affects Koajs Koa. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-8129?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-8129 have an EU (EUVD) identifier?

Yes. CVE-2025-8129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22567.

When was CVE-2025-8129 published?

CVE-2025-8129 was published on 2025-07-25 and last updated on 2026-06-17.

CVE-2025-8129

CVE-2025-8129 is a low-severity vulnerability in Koajs Koa with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
CVSS v2: 4.0
CVSS v4: 2.0
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22567
Weakness: CWE-601
Affected product: Koajs Koa
Published: 2025-07-25
Last modified: 2026-06-17

Description

A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back in the library lib/response.js of the component HTTP Header Handler. The manipulation of the argument Referrer leads to open redirect. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-8129?: A vulnerability, which was classified as problematic, was found in KoaJS Koa up to 3.0.0. Affected is the function back in the library lib/response.js of the component HTTP Header Handler. The manipulation of the argument Referrer leads to open redirect. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-8129?: CVE-2025-8129 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-8129 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-8129?: CVE-2025-8129 primarily affects Koajs Koa. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-8129?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-8129 have an EU (EUVD) identifier?: Yes. CVE-2025-8129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22567.
When was CVE-2025-8129 published?: CVE-2025-8129 was published on 2025-07-25 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:-:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha5:*:*:*:node.js:*:*

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Other CWE-601 (Open Redirect) vulnerabilities

CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
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CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
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CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

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