How severe is CVE-2021-23900?

CVE-2021-23900 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 none, integrity none, and availability high.

Is CVE-2021-23900 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23900?

CVE-2021-23900 affects Owasp Json-sanitizer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23900?

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-2021-23900 published?

CVE-2021-23900 was published on 2021-01-13 and last updated on 2026-06-17.

CVE-2021-23900

CVE-2021-23900 is a high-severity vulnerability in Owasp Json-sanitizer with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Owasp Json-sanitizer
Published: 2021-01-13
Last modified: 2026-06-17

Description

OWASP json-sanitizer before 1.2.2 can output invalid JSON or throw an undeclared exception for crafted input. This may lead to denial of service if the application is not prepared to handle these situations.

Frequently asked questions

What is CVE-2021-23900?: OWASP json-sanitizer before 1.2.2 can output invalid JSON or throw an undeclared exception for crafted input. This may lead to denial of service if the application is not prepared to handle these situations.
How severe is CVE-2021-23900?: CVE-2021-23900 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 none, integrity none, and availability high.
Is CVE-2021-23900 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23900?: CVE-2021-23900 affects Owasp Json-sanitizer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23900?: 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-2021-23900 published?: CVE-2021-23900 was published on 2021-01-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:owasp:json-sanitizer:*:*:*:*:*:*:*:*

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