CVE•Published 2025-08-19•1 article on news•6 live references•NVD data

CVE-2025-55303

Vulnerability data via CVEDB (Shodan)

CVSS v3.1

6.9

MEDIUM

EPSS percentile

Exploit Prediction Scoring System · top 56% of all CVEs

Description

Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18.

Timeline

Published 2025-08-19

External references

NVD MITRE Exploit-DB Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2025-55303

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product + version

product:"Astro Astro" version:"0.18.0"

Version-pinned fingerprint from NVD's first vulnerable CPE.

Shodan · banner/body mention

http.html:"Astro"

HTTP body or banner mentions "Astro" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2025-55303