How severe is CVE-2021-26837?

CVE-2021-26837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26837?

CVE-2021-26837 affects Fortra Delivernow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-26837 published?

CVE-2021-26837 was published on 2023-09-19 and last updated on 2026-06-17.

CVE-2021-26837

CVE-2021-26837 is a critical-severity vulnerability in Fortra Delivernow with a CVSS 3.x base score of 9.8. 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Fortra Delivernow
Published: 2023-09-19
Last modified: 2026-06-17

Description

SQL Injection vulnerability in SearchTextBox parameter in Fortra (Formerly HelpSystems) DeliverNow before version 1.2.18, allows attackers to execute arbitrary code, escalate privileges, and gain sensitive information.

Frequently asked questions

What is CVE-2021-26837?: SQL Injection vulnerability in SearchTextBox parameter in Fortra (Formerly HelpSystems) DeliverNow before version 1.2.18, allows attackers to execute arbitrary code, escalate privileges, and gain sensitive information.
How severe is CVE-2021-26837?: CVE-2021-26837 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26837?: CVE-2021-26837 affects Fortra Delivernow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-26837 published?: CVE-2021-26837 was published on 2023-09-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fortra:delivernow:*:*:*:*:*:*:*:*

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