# What is CVE-2021-23331? > CVE-2021-23331 is a low-severity flaw (CVSS 3.3) in Connect Java Software Development Kit from Squareup, published on 3 February 2021. 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-2021-23331 ## 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:** 14 out of 100 (Info); action: Track. Kept up to date as the evidence changes. - **Severity:** Low (CVSS 3.3 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:** 3 February 2021 - **Record last updated:** 8 April 2022 - **Main product:** Connect Java Software Development Kit from Squareup - **Affected products:** 1 ## What is CVE-2021-23331? In plain terms An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can read some data. ### The official description This affects all versions of package com.squareup:connect. The method prepareDownloadFilecreates creates a temporary file with the permissions bits of -rw-r--r-- on unix-like systems. On unix-like systems, the system temporary directory is shared between users. As such, the contents of the file downloaded by downloadFileFromResponse will be visible to all other users on the local system. A workaround fix for this issue is to set the system property java.io.tmpdir to a safe directory as remediation. Note: This version of the SDK is end of life and no longer maintained, please upgrade to the latest version. ### What kind of flaw is it? - Unknown: Unknown ### How an attack on it works - Where an attacker can be: Already on the device - How hard it is to pull off: Easy: no special conditions - Login needed first: An ordinary user account - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read some data Severity vector: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N` ## Is CVE-2021-23331 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 - 3 February 2021: Published - 8 April 2022: Record last updated ### How Precursor Intelligence ranks it CVE-2021-23331 scores **14 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-2021-23331? The published record lists 1 product. - [Connect Java Software Development Kit](https://www.precursorintelligence.com/product/squareup/connect_java_software_development_kit) by [Squareup](https://www.precursorintelligence.com/vendors/squareup) (Application): all versions ## How do I fix CVE-2021-23331? 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 latest update from the vendor. The references list where the vendor has published details. 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 - [github.com](https://github.com/square/connect-java-sdk/blob/master/src/main/java/com/squareup/connect/ApiClient.java%23L613) (Broken link) - [snyk.io](https://snyk.io/vuln/SNYK-JAVA-COMSQUAREUP-1065988) (Third-party advisory) ## Questions ### What is CVE-2021-23331? CVE-2021-23331 is a low-severity flaw in Connect Java Software Development Kit from Squareup, published on 3 February 2021. An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can read some data. ### How serious is CVE-2021-23331? It scores 3.3 out of 10 on the CVSS severity scale, which is low. Our risk score for CVE-2021-23331 is 14 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-2021-23331 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-2021-23331 affect? For Connect Java Software Development Kit from Squareup: all versions. ### How do I fix CVE-2021-23331? Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2021-23331 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