How severe is CVE-2021-28100?

CVE-2021-28100 has a CVSS score of 6.2/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-28100?

CVE-2021-28100 affects the following packages: com.netflix.priam:priam (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-28100?

No patched version of com.netflix.priam:priam has shipped for CVE-2021-28100 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect CVE-2021-28100 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.netflix.priam:priam, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-28100 if there is no patch (or I can't update yet)?

Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Is CVE-2021-28100 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-28100 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-28100?

CVE-2021-28100 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 16th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2021-28100 published, and has it been updated?

CVE-2021-28100 was published on March 30, 2021 and was last updated on November 8, 2023. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2021-28100 — priam

MEDIUM

CVE-2021-28100 is a medium-severity (CVSS 6.2) vulnerability in com.netflix.priam:priam. No vendor fix is recorded yet; mitigation options are listed below.

Netflix/Priam: Temporary Directory Information Disclosure

Published

Mar 30, 2021

Updated

Nov 8, 2023

Affected

1 pkg

Patched

See advisory

Exploits

None indexed

Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs16th percentile — riskier than 16% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-28100 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

☕com.netflix.priam:priam

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Impact

When File.createTempFile creates a file, the permissions on that file are -rw-r--r--. This means that other users can read the contents of these files after they are written, although they can not modify the contents. This allows for local information disclosure if these files contain sensitive information.

Vulnerable locations:

The custom CodeQL queries leveraged to find these this as well as their results can be found here:

https://lgtm.com/query/1543383251073929777/ https://lgtm.com/query/3142895023158674709/

Official Disclosure

https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-002.md

Fix

There are no fixed versions.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.netflix.priam:priam`	all versions	No fix

Affected Products

1 product · 1 configurations

Application

priamnetflix

all

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.netflix.priam:priam, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of com.netflix.priam:priam has shipped for CVE-2021-28100 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

### Impact When `File.createTempFile` creates a file, the permissions on that file are -rw-r--r--. This means that other users can read the contents of these files after they are written, although they can not modify the contents. This allows for local information disclosure if these files contain sensitive information. Vulnerable locations: - https://github.com/Netflix/Priam/blob/362660bb7ebddb0cfa756a282d94678f65af9f06/priam/src/main/java/com/netflix/priam/backup/MetaData.java#L106-L111 - https://github.com/Netflix/Priam/blob/362660bb7ebddb0cfa756a282d94678f65af9f06/priam/src/main/java/c

O3 Security · Impact-Aware SCA

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