How severe is CVE-2021-44550?

CVE-2021-44550 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44550 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44550?

CVE-2021-44550 affects Stanford Corenlp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-44550?

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

When was CVE-2021-44550 published?

CVE-2021-44550 was published on 2022-02-24 and last updated on 2026-06-17.

CVE-2021-44550

CVE-2021-44550 is a critical-severity vulnerability in Stanford Corenlp with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Stanford Corenlp
Published: 2022-02-24
Last modified: 2026-06-17

Description

An Incorrect Access Control vulnerability exists in CoreNLP 4.3.2 via the classifier in NERServlet.java (lines 158 and 159).

Frequently asked questions

What is CVE-2021-44550?: An Incorrect Access Control vulnerability exists in CoreNLP 4.3.2 via the classifier in NERServlet.java (lines 158 and 159).
How severe is CVE-2021-44550?: CVE-2021-44550 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44550 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44550?: CVE-2021-44550 affects Stanford Corenlp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-44550?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-44550 published?: CVE-2021-44550 was published on 2022-02-24 and last updated on 2026-06-17.

References

https://github.com/stanfordnlp/CoreNLP/issues/1222

Affected products (1)

cpe:2.3:a:stanford:corenlp:4.3.2:*:*:*:*:*:*:*

More vulnerabilities in Stanford Corenlp

CVE-2022-0239 — Critical (CVSS 9.8): corenlp is vulnerable to Improper Restriction of XML External Entity Reference
CVE-2021-3878 — Critical (CVSS 9.8): corenlp is vulnerable to Improper Restriction of XML External Entity Reference
CVE-2021-3869 — High (CVSS 7.5): corenlp is vulnerable to Improper Restriction of XML External Entity Reference
CVE-2022-0198 — High (CVSS 7.1): corenlp is vulnerable to Improper Restriction of XML External Entity Reference

All CVEs affecting Stanford Corenlp →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-25586 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty…
CVE-2026-25520 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped.…
CVE-2025-20265 — Critical (CVSS 10.0): A vulnerability in the RADIUS subsystem implementation of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2025-20337 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-20281 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2024-42472 — Critical (CVSS 10.0): Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →