How severe is CVE-2021-31702?

CVE-2021-31702 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-2021-31702 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31702?

CVE-2021-31702 affects Frontiersoftware Ichris. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31702?

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-2021-31702 published?

CVE-2021-31702 was published on 2021-05-29 and last updated on 2026-06-17.

CVE-2021-31702

CVE-2021-31702 is a high-severity vulnerability in Frontiersoftware Ichris 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: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Frontiersoftware Ichris
Published: 2021-05-29
Last modified: 2026-06-17

Description

Frontier ichris through 5.18 mishandles making a DNS request for the hostname in the HTTP Host header, as demonstrated by submitting 127.0.0.1 multiple times for DoS.

Frequently asked questions

What is CVE-2021-31702?: Frontier ichris through 5.18 mishandles making a DNS request for the hostname in the HTTP Host header, as demonstrated by submitting 127.0.0.1 multiple times for DoS.
How severe is CVE-2021-31702?: CVE-2021-31702 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-2021-31702 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31702?: CVE-2021-31702 affects Frontiersoftware Ichris. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31702?: 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-2021-31702 published?: CVE-2021-31702 was published on 2021-05-29 and last updated on 2026-06-17.

References

https://github.com/l00neyhacker/CVE-2021-31702

Affected products (1)

cpe:2.3:a:frontiersoftware:ichris:*:*:*:*:*:*:*:*

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