# What is CVE-2023-32373?

> CVE-2023-32373 is a high-severity flaw (CVSS 8.8) in Safari from Apple, published on 23 June 2023. It is on the list of flaws known to be exploited, so criminals are already using it. The latest forecast puts its chance of use in the next 30 days at 12%. If you run an affected version, patch it first.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-32373

## At a glance

- **Verdict:** Fix this now. Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.
- **Precursor Intelligence risk score:** 71 out of 100 (High); action: Emergency patch. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 8.8 out of 10)
- **Known to be exploited:** Yes, it is on the government list of flaws known to be exploited
- **Chance of use in the next 30 days:** 12% (latest exploit-likelihood forecast)
- **Published:** 23 June 2023
- **Record last updated:** 23 October 2025
- **Main product:** Safari from Apple
- **Affected products:** 8

## What is CVE-2023-32373? In plain terms

It can be attacked from anywhere on the internet without logging in, but a person has to take an action first. If it works, the attacker can read data, change data and take it offline.

### The official description

A use-after-free issue was addressed with improved memory management. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

### What kind of flaw is it?

- CWE-416: Use After Free

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: Yes, a person has to take an action
- What an attacker gets: Can read data, change data and take it offline

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Is CVE-2023-32373 being exploited? Yes

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 12%.

Exploit likelihood over the last 7 days: 12%, 12%, 12%, 12%, 12%, 12%, 12%.

### Timeline

- 23 June 2023: Published
- 23 October 2025: Record last updated
- 16 June 2026: Exploit likelihood jumped

### How Precursor Intelligence ranks it

CVE-2023-32373 scores **71 out of 100 (High)**, with the action "Emergency patch".

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-2023-32373?

The published record lists 8 products. Versions are as published: "before 16.5" means every version up to, but not including, 16.5.

- [Safari](https://www.precursorintelligence.com/product/apple/safari) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Application): before 16.5
- [Enterprise Linux](https://www.precursorintelligence.com/product/redhat/enterprise_linux) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.0, 7.0, 8.0, 9.0
- [iPadOS](https://www.precursorintelligence.com/product/apple/ipados) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Operating system): before 15.7.6, 16.0 to before 16.5
- [iOS](https://www.precursorintelligence.com/product/apple/iphone_os) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Operating system): 15.0 to before 15.7.6, 16.0 to before 16.5
- [macOS](https://www.precursorintelligence.com/product/apple/macos) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Operating system): before 13.4
- [tvOS](https://www.precursorintelligence.com/product/apple/tvos) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Operating system): before 16.5
- [watchOS](https://www.precursorintelligence.com/product/apple/watchos) by [Apple](https://www.precursorintelligence.com/vendors/apple) (Operating system): before 9.5
- Webkitgtk+ by [Webkitgtk](https://www.precursorintelligence.com/vendors/webkitgtk) (Application): before 2.42.3

## How do I fix CVE-2023-32373?

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 advisories and patch notes 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. **Check it wasn’t used before you patched.** Because criminals are already using this flaw, look for signs of a break-in on affected systems using the vendor’s guidance.

### References

- [support.apple.com](https://support.apple.com/en-us/HT213757) (Release notes, Vendor advisory)
- [support.apple.com](https://support.apple.com/en-us/HT213758) (Release notes, Vendor advisory)
- [support.apple.com](https://support.apple.com/en-us/HT213761) (Release notes, Vendor advisory)
- [support.apple.com](https://support.apple.com/en-us/HT213762) (Release notes, Vendor advisory)
- [support.apple.com](https://support.apple.com/en-us/HT213764) (Release notes, Vendor advisory)
- [support.apple.com](https://support.apple.com/en-us/HT213765) (Release notes, Vendor advisory)
- [security.gentoo.org](https://security.gentoo.org/glsa/202401-04) (Third-party advisory)
- [cisa.gov](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-32373) (Government resource)

## Questions

### What is CVE-2023-32373?

CVE-2023-32373 is a high-severity flaw in Safari from Apple, published on 23 June 2023. It can be attacked from anywhere on the internet without logging in, but a person has to take an action first. If it works, the attacker can read data, change data and take it offline.

### How serious is CVE-2023-32373?

It scores 8.8 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2023-32373 is 71 out of 100, which is High. Its action is "Emergency patch". Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.

### Is CVE-2023-32373 being exploited?

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 12%.

### Which versions does CVE-2023-32373 affect?

For Safari from Apple: before 16.5. The record lists 8 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2023-32373?

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. Because criminals are already using it, also check affected systems for signs of a break-in.

## Does CVE-2023-32373 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.

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