How severe is CVE-2021-44138?

CVE-2021-44138 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-44138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44138?

CVE-2021-44138 affects Caucho Resin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-44138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-44138 published?

CVE-2021-44138 was published on 2022-04-04 and last updated on 2026-06-17.

CVE-2021-44138

CVE-2021-44138 is a high-severity vulnerability in Caucho Resin with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Caucho Resin
Published: 2022-04-04
Last modified: 2026-06-17

Description

There is a Directory traversal vulnerability in Caucho Resin, as distributed in Resin 4.0.52 - 4.0.56, which allows remote attackers to read files in arbitrary directories via a ; in a pathname within an HTTP request.

Frequently asked questions

What is CVE-2021-44138?: There is a Directory traversal vulnerability in Caucho Resin, as distributed in Resin 4.0.52 - 4.0.56, which allows remote attackers to read files in arbitrary directories via a ; in a pathname within an HTTP request.
How severe is CVE-2021-44138?: CVE-2021-44138 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-44138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44138?: CVE-2021-44138 affects Caucho Resin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-44138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-44138 published?: CVE-2021-44138 was published on 2022-04-04 and last updated on 2026-06-17.

References

https://github.com/maybe-why-not/reponame/issues/2

Affected products (1)

cpe:2.3:a:caucho:resin:*:*:*:*:*:*:*:*

More vulnerabilities in Caucho Resin

CVE-2012-2967 — High (CVSS 7.5): Caucho Quercus, as distributed in Resin before 4.0.29, does not properly implement the == (equals sign equals sign)…
CVE-2012-2966 — High (CVSS 7.5): Caucho Quercus, as distributed in Resin before 4.0.29, overwrites entries in the SERVER superglobal array on the basis…
CVE-2012-2965 — High (CVSS 7.5): Caucho Quercus, as distributed in Resin before 4.0.29, does not properly handle unspecified characters in the names of…
CVE-2012-2969 — Medium (CVSS 6.4): Caucho Quercus, as distributed in Resin before 4.0.29, allows remote attackers to bypass intended restrictions on…
CVE-2014-2966 — Medium (CVSS 5.0): The ISO-8859-1 encoder in Resin Pro before 4.0.40 does not properly perform Unicode transformations, which allows…
CVE-2012-2968 — Medium (CVSS 5.0): Directory traversal vulnerability in Caucho Quercus, as distributed in Resin before 4.0.29, allows remote attackers to…

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