How severe is CVE-2021-42109?

CVE-2021-42109 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-2021-42109 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42109?

CVE-2021-42109 primarily affects Vitec Exterity Avediaserver. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-42109?

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-2021-42109 published?

CVE-2021-42109 was published on 2021-10-08 and last updated on 2026-06-17.

CVE-2021-42109

CVE-2021-42109 is a critical-severity vulnerability in Vitec Exterity Avediaserver 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-1188.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1188
Affected product: Vitec Exterity Avediaserver
Published: 2021-10-08
Last modified: 2026-06-17

Description

VITEC Exterity IPTV products through 2021-04-30 allow privilege escalation to root.

Frequently asked questions

What is CVE-2021-42109?: VITEC Exterity IPTV products through 2021-04-30 allow privilege escalation to root.
How severe is CVE-2021-42109?: CVE-2021-42109 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-2021-42109 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42109?: CVE-2021-42109 primarily affects Vitec Exterity Avediaserver. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-42109?: 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-2021-42109 published?: CVE-2021-42109 was published on 2021-10-08 and last updated on 2026-06-17.

References

Affected products (10)

cpe:2.3:a:vitec:exterity_avediaserver:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:exterity_avediastream_encoders_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_m9605_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_m9400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_m9405_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_m9305_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_r9300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_r9310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_m9325_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:vitec:avediastream_r9350_firmware:*:*:*:*:*:*:*:*

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