How severe is CVE-2021-27839?

CVE-2021-27839 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27839?

CVE-2021-27839 affects Bigprof Online Invoicing System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27839?

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

When was CVE-2021-27839 published?

CVE-2021-27839 was published on 2021-03-03 and last updated on 2026-06-17.

CVE-2021-27839

CVE-2021-27839 is a medium-severity vulnerability in Bigprof Online Invoicing System with a CVSS 3.x base score of 4.4. 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-1236.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1236
Affected product: Bigprof Online Invoicing System
Published: 2021-03-03
Last modified: 2026-06-17

Description

A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.

Frequently asked questions

What is CVE-2021-27839?: A CSV injection vulnerability found in Online Invoicing System (OIS) 4.3 and below can be exploited by users to perform malicious actions such as redirecting admins to unknown or harmful websites, or disclosing other clients' details that the user did not have access to.
How severe is CVE-2021-27839?: CVE-2021-27839 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27839?: CVE-2021-27839 affects Bigprof Online Invoicing System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27839 published?: CVE-2021-27839 was published on 2021-03-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bigprof:online_invoicing_system:*:*:*:*:*:*:*:*

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