How severe is CVE-2021-43564?

CVE-2021-43564 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-43564?

CVE-2021-43564 affects the following packages: hov/jobfair (Packagist), hov/jobfair (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2021-43564?

Update hov/jobfair to 1.0.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43564 is resolved across your whole dependency graph.

How do I detect CVE-2021-43564 in my Packagist dependencies?

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

How do I mitigate CVE-2021-43564 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-43564 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-43564 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-2021-43564?

CVE-2021-43564 has an EPSS (Exploit Prediction Scoring System) score of 1.0%, placing it in the 62th 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-2021-43564 published, and has it been updated?

CVE-2021-43564 was published on November 15, 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.

🐘

🐘 Packagist

Not in CISA KEV

HIGH severity

CVE-2021-43564 — jobfair

HIGH

CVE-2021-43564 is a high-severity (CVSS 7.5) vulnerability in hov/jobfair. A fix is available for hov/jobfair — see the affected versions and patch details below.

Unrestricted access to predictable file paths in hov/jobfair

Published

Nov 15, 2021

Updated

Nov 8, 2023

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs62th percentile — riskier than 62% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2021-43564 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected

🐘hov/jobfair🐘hov/jobfair

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

Description

An issue was discovered in the jobfair (aka Job Fair) extension before 1.0.13 and 2.x before 2.0.2 for TYPO3. The extension fails to protect or obfuscate filenames of uploaded files. This allows unauthenticated users to download files with sensitive data by simply guessing the filename of uploaded files (e.g., uploads/tx_jobfair/cv.pdf).

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`hov/jobfair`	all versions	1.0.13`composer require hov/jobfair:^1.0.13`
🐘Packagist	`hov/jobfair`	≥ 2.0.0&&< 2.0.2	2.0.2`composer require hov/jobfair:^2.0.2`

Affected Products

1 product · 2 configurations

Application

job fairjob_fair_project

≥ 2.0.0 && < 2.0.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hov/jobfair, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update hov/jobfair to 1.0.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43564 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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