How severe is CVE-2021-3965?

CVE-2021-3965 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-2021-3965 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3965?

CVE-2021-3965 primarily affects Hp Designjet T920 Cr355a Firmware. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3965?

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-2021-3965 published?

CVE-2021-3965 was published on 2022-01-14 and last updated on 2026-06-17.

CVE-2021-3965

CVE-2021-3965 is a high-severity vulnerability in Hp Designjet T920 Cr355a Firmware 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-639.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Hp Designjet T920 Cr355a Firmware
Published: 2022-01-14
Last modified: 2026-06-17

Description

Certain HP DesignJet products may be vulnerable to unauthenticated HTTP requests which allow viewing and downloading of print job previews.

Frequently asked questions

What is CVE-2021-3965?: Certain HP DesignJet products may be vulnerable to unauthenticated HTTP requests which allow viewing and downloading of print job previews.
How severe is CVE-2021-3965?: CVE-2021-3965 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-2021-3965 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3965?: CVE-2021-3965 primarily affects Hp Designjet T920 Cr355a Firmware. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3965?: 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-2021-3965 published?: CVE-2021-3965 was published on 2022-01-14 and last updated on 2026-06-17.

References

https://support.hp.com/us-en/document/ish_5268198-5268230-16

Affected products (27)

cpe:2.3:o:hp:designjet_t920_cr355a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t920_cr355b_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t920_cr354a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t930_l2y22a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t930_l2y22b_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t930_l2y21a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t930_l2y21b_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t1530_l2y24a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t1530_l2y24b_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t1530_l2y23a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t2530_l2y25a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t2530_l2y26a_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t2530_l2y26b_firmware:mry_07_07_04.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t3500_b9e24a_firmware:aeneas_04_09_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t3500_b9e24b_firmware:aeneas_04_09_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_t3500_b9e25a_firmware:aeneas_04_09_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6800_f2s72a_firmware:ptr8_03_07_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6800_f2s72ar_firmware:ptr8_03_07_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6800_f2s72b_firmware:ptr8_03_07_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6600_f2s71a_firmware:ptr6_03_07_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6600_f2s71ar_firmware:ptr6_03_07_06.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6810_2qu12a_firmware:px8_06_05_02.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6810_2qu12b_firmware:px8_06_05_02.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6810_2qu14a_firmware:px8_06_05_02.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6810_2qu14b_firmware:px8_06_05_02.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6610_2qu13b_firmware:px6_06_05_02.1:*:*:*:*:*:*:*
cpe:2.3:o:hp:designjet_z6610_2qu13a_firmware:px6_06_05_02.1:*:*:*:*:*:*:*

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →