How severe is CVE-2021-42838?

CVE-2021-42838 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-42838 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42838?

CVE-2021-42838 primarily affects Vice Webopac. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-42838?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42838 published?

CVE-2021-42838 was published on 2021-11-15 and last updated on 2026-06-17.

CVE-2021-42838

CVE-2021-42838 is a medium-severity vulnerability in Vice Webopac with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Vice Webopac
Published: 2021-11-15
Last modified: 2026-06-17

Description

Grand Vice info Co. webopac7 book search field parameter does not properly restrict the input of special characters, thus unauthenticated attackers can inject JavaScript syntax remotely, and further perform reflective XSS attacks.

Frequently asked questions

What is CVE-2021-42838?: Grand Vice info Co. webopac7 book search field parameter does not properly restrict the input of special characters, thus unauthenticated attackers can inject JavaScript syntax remotely, and further perform reflective XSS attacks.
How severe is CVE-2021-42838?: CVE-2021-42838 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-42838 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42838?: CVE-2021-42838 primarily affects Vice Webopac. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-42838?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42838 published?: CVE-2021-42838 was published on 2021-11-15 and last updated on 2026-06-17.

References

https://www.twcert.org.tw/tw/cp-132-5286-b92c8-1.html

Affected products (2)

cpe:2.3:a:vice:webopac:1.8.20160701:*:*:*:*:*:*:*
cpe:2.3:a:vice:webopac:7.1.20160701:*:*:*:*:*:*:*

More vulnerabilities in Vice Webopac

CVE-2024-11020 — Critical (CVSS 9.8): Webopac from Grand Vice info has a SQL Injection vulnerability, allowing unauthenticated remote attacks to inject…
CVE-2024-11018 — Critical (CVSS 9.8): Webopac from Grand Vice info does not properly validate uploaded file types, allowing unauthenticated remote attackers…
CVE-2024-11016 — Critical (CVSS 9.8): Webopac from Grand Vice info has a SQL Injection vulnerability, allowing unauthenticated remote attacks to inject…
CVE-2024-11017 — High (CVSS 8.8): Webopac from Grand Vice info does not properly validate uploaded file types, allowing remote attackers with regular…
CVE-2021-42839 — High (CVSS 8.8): Grand Vice info Co. webopac7 file upload function fails to filter special characters. While logging in with general…
CVE-2024-11019 — Medium (CVSS 6.1): Webopac from Grand Vice info has a Reflected Cross-site Scripting vulnerability, allowing unauthenticated remote…

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