How severe is CVE-2021-22656?

CVE-2021-22656 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-2021-22656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22656?

CVE-2021-22656 affects Advantech Iview. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-22656?

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-2021-22656 published?

CVE-2021-22656 was published on 2021-02-11 and last updated on 2026-06-17.

CVE-2021-22656

CVE-2021-22656 is a high-severity vulnerability in Advantech Iview 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Advantech Iview
Published: 2021-02-11
Last modified: 2026-06-17

Description

Advantech iView versions prior to v5.7.03.6112 are vulnerable to directory traversal, which may allow an attacker to read sensitive files.

Frequently asked questions

What is CVE-2021-22656?: Advantech iView versions prior to v5.7.03.6112 are vulnerable to directory traversal, which may allow an attacker to read sensitive files.
How severe is CVE-2021-22656?: CVE-2021-22656 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-2021-22656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22656?: CVE-2021-22656 affects Advantech Iview. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-22656?: 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-2021-22656 published?: CVE-2021-22656 was published on 2021-02-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:advantech:iview:*:*:*:*:*:*:*:*

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