# What is CVE-2024-7347? > CVE-2024-7347 is a medium-severity flaw (CVSS 5.7) in Nginx Open Source from F5, published on 14 August 2024. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.3%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2024-7347 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 18 out of 100 (Info); action: Track. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 5.7 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 0.3% (latest exploit-likelihood forecast) - **Published:** 14 August 2024 - **Record last updated:** 17 June 2026 - **Main product:** Nginx Open Source from F5 - **Affected products:** 2 ## What is CVE-2024-7347? In plain terms An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. ### The official description NGINX Open Source and NGINX Plus have a vulnerability in the ngx_http_mp4_module, which might allow an attacker to over-read NGINX worker memory resulting in its termination, using a specially crafted mp4 file. The issue only affects NGINX if it is built with the ngx_http_mp4_module and the mp4 directive is used in the configuration file. Additionally, the attack is possible only if an attacker can trigger the processing of a specially crafted mp4 file with the ngx_http_mp4_module.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. ### What kind of flaw is it? - CWE-126: Buffer Over-read - CWE-125: Out-of-bounds Read ### How an attack on it works - Where an attacker can be: Already on the device - How hard it is to pull off: Hard: conditions must line up - Login needed first: An ordinary user account - Does someone have to click: No, nobody has to do anything Severity vector: `CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X` ## Is CVE-2024-7347 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%. ### Timeline - 14 August 2024: Published - 17 June 2026: Record last updated ### How Precursor Intelligence ranks it CVE-2024-7347 scores **18 out of 100 (Info)**, with the action "Track". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2024-7347? The published record lists 2 products. Versions are as published: "1.5.13 to before 1.26.2" means from 1.5.13 up to, but not including, 1.26.2. - [Nginx Open Source](https://www.precursorintelligence.com/product/f5/nginx_open_source) by [F5](https://www.precursorintelligence.com/vendors/f5) (Application): 1.5.13 to before 1.26.2, 1.27.0 - [Nginx Plus](https://www.precursorintelligence.com/product/f5/nginx_plus) by [F5](https://www.precursorintelligence.com/vendors/f5) (Application): r27 to before r31, r31, r31-p1, r32 ## How do I fix CVE-2024-7347? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [my.f5.com](https://my.f5.com/manage/s/article/K000140529) (Vendor advisory) - [openwall.com](http://www.openwall.com/lists/oss-security/2024/08/14/4) (Mailing list) - [lists.debian.org](https://lists.debian.org/debian-lts-announce/2025/03/msg00017.html) ## Questions ### What is CVE-2024-7347? CVE-2024-7347 is a medium-severity flaw in Nginx Open Source from F5, published on 14 August 2024. An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. ### How serious is CVE-2024-7347? It scores 5.7 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2024-7347 is 18 out of 100, which is Info. Its action is "Track". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2024-7347 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2024-7347 affect? For Nginx Open Source from F5: 1.5.13 to before 1.26.2, 1.27.0. The record lists 2 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2024-7347? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2024-7347 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact