How severe is CVE-2021-28817?

CVE-2021-28817 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28817 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28817?

CVE-2021-28817 primarily affects Tibco Rendezvous. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28817?

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-2021-28817 published?

CVE-2021-28817 was published on 2021-03-23 and last updated on 2026-06-17.

CVE-2021-28817

CVE-2021-28817 is a high-severity vulnerability in Tibco Rendezvous with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Tibco Rendezvous
Published: 2021-03-23
Last modified: 2026-06-17

Description

The Windows Installation component of TIBCO Software Inc.'s TIBCO Rendezvous and TIBCO Rendezvous Developer Edition contains a vulnerability that theoretically allows a low privileged attacker with local access on some versions of the Windows operating system to insert malicious software. The affected component can be abused to execute the malicious software inserted by the attacker with the elevated privileges of the component. This vulnerability results from a lack of access restrictions on certain files and/or folders in the installation. Affected releases are TIBCO Software Inc.'s TIBCO Rendezvous: versions 8.5.1 and below and TIBCO Rendezvous Developer Edition: versions 8.5.1 and below.

Frequently asked questions

What is CVE-2021-28817?: The Windows Installation component of TIBCO Software Inc.'s TIBCO Rendezvous and TIBCO Rendezvous Developer Edition contains a vulnerability that theoretically allows a low privileged attacker with local access on some versions of the Windows operating system to insert malicious software. The affected component can be abused to execute the malicious software inserted by the attacker with the elevated privileges of the component. This vulnerability results from a lack of access restrictions on certain files and/or folders in the installation. Affected releases are TIBCO Software Inc.'s TIBCO Rendezvous: versions 8.5.1 and below and TIBCO Rendezvous Developer Edition: versions 8.5.1 and below.
How severe is CVE-2021-28817?: CVE-2021-28817 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28817 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28817?: CVE-2021-28817 primarily affects Tibco Rendezvous. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28817?: 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-2021-28817 published?: CVE-2021-28817 was published on 2021-03-23 and last updated on 2026-06-17.

References

http://www.tibco.com/services/support/advisories

Affected products (2)

cpe:2.3:a:tibco:rendezvous:*:*:*:*:*:*:*:*
cpe:2.3:a:tibco:rendezvous:*:*:*:*:developer:*:*:*

More vulnerabilities in Tibco Rendezvous

CVE-2008-1703 — Critical (CVSS 9.3): Multiple buffer overflows in TIBCO Software Rendezvous before 8.1.0, as used in multiple TIBCO products, allow remote…
CVE-2021-28818 — High (CVSS 8.8): The Rendezvous Routing Daemon (rvrd), Rendezvous Secure Routing Daemon (rvrsd), Rendezvous Secure Daemon (rvsd),…
CVE-2007-4158 — High (CVSS 7.8): Memory leak in TIBCO Rendezvous (RV) daemon (rvd) 7.5.2, 7.5.3 and 7.5.4 allows remote attackers to cause a denial of…
CVE-2007-4162 — High (CVSS 7.8): TIBCO Rendezvous (RV) 7.5.2 does not protect confidentiality or integrity of inter-daemon communication, which allows…
CVE-2018-12414 — High (CVSS 7.5): The Rendezvous Routing Daemon (rvrd), Rendezvous Secure Routing Daemon (rvrsd), Rendezvous Secure Daemon (rvsd),…
CVE-2015-4555 — High (CVSS 7.5): Buffer overflow in the HTTP administrative interface in TIBCO Rendezvous before 8.4.4, Rendezvous Network Server before…

All CVEs affecting Tibco Rendezvous →