How severe is CVE-2020-28944?

CVE-2020-28944 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-2020-28944 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28944?

CVE-2020-28944 affects Open-xchange Ox Guard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28944?

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-2020-28944 published?

CVE-2020-28944 was published on 2021-04-30 and last updated on 2026-06-17.

CVE-2020-28944

CVE-2020-28944 is a high-severity vulnerability in Open-xchange Ox Guard 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. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Open-xchange Ox Guard
Published: 2021-04-30
Last modified: 2026-06-17

Description

OX Guard 2.10.4 and earlier allows a Denial of Service via a WKS server that responds slowly or with a large amount of data.

Frequently asked questions

What is CVE-2020-28944?: OX Guard 2.10.4 and earlier allows a Denial of Service via a WKS server that responds slowly or with a large amount of data.
How severe is CVE-2020-28944?: CVE-2020-28944 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-2020-28944 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28944?: CVE-2020-28944 affects Open-xchange Ox Guard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28944?: 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-2020-28944 published?: CVE-2020-28944 was published on 2021-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open-xchange:ox_guard:*:*:*:*:*:*:*:*

More vulnerabilities in Open-xchange Ox Guard

CVE-2018-10986 — High (CVSS 8.8): OX Guard 2.8.0 has CSRF.
CVE-2015-8542 — High (CVSS 8.8): An issue was discovered in Open-Xchange Guard before 2.2.0-rev8. The "getprivkeybyid" API call is used to download a…
CVE-2016-4028 — High (CVSS 7.5): An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. OX Guard uses an authentication token to identify…
CVE-2020-9426 — Medium (CVSS 6.1): OX Guard 2.10.3 and earlier allows XSS.
CVE-2016-6854 — Medium (CVSS 6.1): An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code which got injected to a mail with…
CVE-2016-6853 — Medium (CVSS 6.1): An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code and references to external websites can…

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