CVE-2023-7080
Arbitrary remote code execution within wrangler dev Workers sandbox
- Published
- Updated
- Reserved
- Assigned by
- cloudflare
Description
The V8 inspector intentionally allows arbitrary code execution within the Workers sandbox for debugging. wrangler dev would previously start an inspector server listening on all network interfaces. This would allow an attacker on the local network to connect to the inspector and run arbitrary code. Additionally, the inspector server did not validate Origin/Host headers, granting an attacker that can trick any user on the local network into opening a malicious website the ability to run code. If wrangler dev --remote was being used, an attacker could access production resources if they were bound to the worker. This issue was fixed in [email protected] and [email protected]. Whilst wrangler dev's inspector server listens on local interfaces by default as of [email protected], an SSRF vulnerability in miniflare https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-fwvg-2739-22v7 (CVE-2023-7078) allowed access from the local network until [email protected]. [email protected] and [email protected] introduced validation for the Origin/Host headers.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| cloudflareCNA (assigner) | 3.1 | High8.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | High8.0 | CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.63% · top 50% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.5.
Weakness
Affected products
- affected ≤ 3.0.0
- affected < 3.19.0
- affected ≤ 2.0.0
- affected < 2.20.2
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmwranglerGHSA-f8mp-x433-5wpf (opens in a new tab)
What to do
Workaround: Unfortunately, Wrangler doesn't provide any configuration for which host that inspector server should listen on. Please upgrade to at least [email protected], and configure Wrangler to listen on local interfaces instead with wrangler dev --ip 127.0.0.1 to prevent SSRF. This removes the local network as an attack vector, but does not prevent an attack from visiting a malicious website.
References (5)
- https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-f8mp-x433-5wpf (opens in a new tab)x_transferred
- https://github.com/cloudflare/workers-sdk/issues/4430 (opens in a new tab)x_transferred
- https://github.com/cloudflare/workers-sdk/pull/4437 (opens in a new tab)x_transferred
- https://github.com/cloudflare/workers-sdk/pull/4535 (opens in a new tab)x_transferred
- https://github.com/cloudflare/workers-sdk/pull/4550 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-f8mp-x433-5wpf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-7080)Record last updated .