How severe is CVE-2021-0296?

CVE-2021-0296 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-0296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-0296?

CVE-2021-0296 primarily affects Juniper Ctpview. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-0296?

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-2021-0296 published?

CVE-2021-0296 was published on 2021-10-19 and last updated on 2026-06-17.

CVE-2021-0296

CVE-2021-0296 is a high-severity vulnerability in Juniper Ctpview with a CVSS 3.x base score of 7.4. 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-319.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-319
Affected product: Juniper Ctpview
Published: 2021-10-19
Last modified: 2026-06-17

Description

The Juniper Networks CTPView server is not enforcing HTTP Strict Transport Security (HSTS). HSTS is an optional response header which allows servers to indicate that content from the requested domain will only be served over HTTPS. The lack of HSTS may leave the system vulnerable to downgrade attacks, SSL-stripping man-in-the-middle attacks, and weakens cookie-hijacking protections. This issue affects Juniper Networks CTPView: 7.3 versions prior to 7.3R7; 9.1 versions prior to 9.1R3.

Frequently asked questions

What is CVE-2021-0296?: The Juniper Networks CTPView server is not enforcing HTTP Strict Transport Security (HSTS). HSTS is an optional response header which allows servers to indicate that content from the requested domain will only be served over HTTPS. The lack of HSTS may leave the system vulnerable to downgrade attacks, SSL-stripping man-in-the-middle attacks, and weakens cookie-hijacking protections. This issue affects Juniper Networks CTPView: 7.3 versions prior to 7.3R7; 9.1 versions prior to 9.1R3.
How severe is CVE-2021-0296?: CVE-2021-0296 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-0296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-0296?: CVE-2021-0296 primarily affects Juniper Ctpview. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-0296?: 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-2021-0296 published?: CVE-2021-0296 was published on 2021-10-19 and last updated on 2026-06-17.

References

https://kb.juniper.net/JSA11210

Affected products (8)

cpe:2.3:a:juniper:ctpview:7.3:r1:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:7.3:r2:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:7.3:r3:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:7.3:r4:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:7.3:r5:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:7.3:r6:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:9.1:r1:*:*:*:*:*:*
cpe:2.3:a:juniper:ctpview:9.1:r2:*:*:*:*:*:*

More vulnerabilities in Juniper Ctpview

CVE-2009-0115 — High (CVSS 7.8): The Device Mapper multipathing driver (aka multipath-tools or device-mapper-multipath) 0.4.8, as used in SUSE openSUSE,…
CVE-2009-1185 — High (CVSS 7.2): udev before 1.4.1 does not verify whether a NETLINK message originates from kernel space, which allows local users to…

All CVEs affecting Juniper Ctpview →

Other CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities

CVE-2025-4378 — Critical (CVSS 10.0): Cleartext Transmission of Sensitive Information, Use of Hard-coded Credentials vulnerability in Ataturk University…
CVE-2025-47419 — Critical (CVSS 10.0): Cleartext Transmission of Sensitive Information vulnerability in Crestron Automate VX allows Sniffing Network…
CVE-2026-48902 — Critical (CVSS 9.8): The password and username reset features created plain http links for https connections if the "Force SSL" flag wasn't…
CVE-2025-34271 — Critical (CVSS 9.8): Nagios Log Server versions prior to 2024R2.0.2 contain a vulnerability in the cluster manager component when…
CVE-2025-32880 — Critical (CVSS 9.8): An issue was discovered on COROS PACE 3 devices through 3.0808.0. It implements a function to connect the watch to a…
CVE-2025-26199 — Critical (CVSS 9.8): CloudClassroom-PHP-Project v1.0 is affected by an insecure credential transmission vulnerability. The application…

Browse all CWE-319 (Cleartext Transmission of Sensitive Information) vulnerabilities →