How severe is CVE-2021-43691?

CVE-2021-43691 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-2021-43691 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43691?

CVE-2021-43691 affects Tripexpress Project Tripexpress. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43691?

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-2021-43691 published?

CVE-2021-43691 was published on 2021-11-29 and last updated on 2026-06-17.

CVE-2021-43691

CVE-2021-43691 is a critical-severity vulnerability in Tripexpress Project Tripexpress 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-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Tripexpress Project Tripexpress
Published: 2021-11-29
Last modified: 2026-06-17

Description

tripexpress v1.1 is affected by a path manipulation vulnerability in file system/helpers/dompdf/load_font.php. The variable src is coming from $_SERVER["argv"] then there is a path manipulation vulnerability.

Frequently asked questions

What is CVE-2021-43691?: tripexpress v1.1 is affected by a path manipulation vulnerability in file system/helpers/dompdf/load_font.php. The variable src is coming from $_SERVER["argv"] then there is a path manipulation vulnerability.
How severe is CVE-2021-43691?: CVE-2021-43691 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-2021-43691 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43691?: CVE-2021-43691 affects Tripexpress Project Tripexpress. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43691?: 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-2021-43691 published?: CVE-2021-43691 was published on 2021-11-29 and last updated on 2026-06-17.

References

https://github.com/toocool/tripexpress/issues/40

Affected products (1)

cpe:2.3:a:tripexpress_project:tripexpress:1.1:*:*:*:*:*:*:*

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