How severe is CVE-2020-29056?

CVE-2020-29056 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-2020-29056 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29056?

CVE-2020-29056 primarily affects Cdatatec 72408a Firmware. In total, 112 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-29056?

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-2020-29056 published?

CVE-2020-29056 was published on 2020-11-24 and last updated on 2026-06-17.

CVE-2020-29056

CVE-2020-29056 is a critical-severity vulnerability in Cdatatec 72408a Firmware 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Cdatatec 72408a Firmware
Published: 2020-11-24
Last modified: 2026-06-17

Description

An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P, 97168P, FD1002S, FD1104, FD1104B, FD1104S, FD1104SN, FD1108S, FD1204S-R2, FD1204SN, FD1204SN-R2, FD1208S-R2, FD1216S-R1, FD1608GS, FD1608SN, FD1616GS, FD1616SN, and FD8000 devices. One can escape from a shell and acquire root privileges by leveraging the TFTP download configuration.

Frequently asked questions

What is CVE-2020-29056?: An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P, 97168P, FD1002S, FD1104, FD1104B, FD1104S, FD1104SN, FD1108S, FD1204S-R2, FD1204SN, FD1204SN-R2, FD1208S-R2, FD1216S-R1, FD1608GS, FD1608SN, FD1616GS, FD1616SN, and FD8000 devices. One can escape from a shell and acquire root privileges by leveraging the TFTP download configuration.
How severe is CVE-2020-29056?: CVE-2020-29056 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-2020-29056 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29056?: CVE-2020-29056 primarily affects Cdatatec 72408a Firmware. In total, 112 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-29056?: 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-2020-29056 published?: CVE-2020-29056 was published on 2020-11-24 and last updated on 2026-06-17.

References

https://pierrekim.github.io/blog/2020-07-07-cdata-olt-0day-vulnerabilities.html

Affected products (112)

cpe:2.3:o:cdatatec:72408a_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:72408a_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:72408a_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:72408a_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9008a_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9008a_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9008a_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9008a_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9016a_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9016a_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9016a_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9016a_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92408a_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92408a_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92408a_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92408a_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92416a_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92416a_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92416a_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:92416a_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9288_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9288_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9288_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:9288_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97016_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97016_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97016_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97016_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97024p_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97024p_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97024p_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97024p_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97028p_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97028p_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97028p_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97028p_firmware:2.4.05_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97042p_firmware:1.2.2:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97042p_firmware:2.4.03_000:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97042p_firmware:2.4.04_001:*:*:*:*:*:*:*
cpe:2.3:o:cdatatec:97042p_firmware:2.4.05_000:*:*:*:*:*:*:*

More vulnerabilities in Cdatatec 72408a Firmware

CVE-2020-29062 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…
CVE-2020-29061 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…
CVE-2020-29060 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…
CVE-2020-29059 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…
CVE-2020-29058 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…
CVE-2020-29054 — Critical (CVSS 9.8): An issue was discovered on CDATA 72408A, 9008A, 9016A, 92408A, 92416A, 9288, 97016, 97024P, 97028P, 97042P, 97084P,…

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