How severe is CVE-2021-44429?

CVE-2021-44429 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 none, integrity none, and availability high.

Is CVE-2021-44429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44429?

CVE-2021-44429 affects Vercot Serva. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-44429?

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-2021-44429 published?

CVE-2021-44429 was published on 2021-11-29 and last updated on 2026-06-17.

CVE-2021-44429

CVE-2021-44429 is a high-severity vulnerability in Vercot Serva 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Vercot Serva
Published: 2021-11-29
Last modified: 2026-06-17

Description

Serva 4.4.0 allows remote attackers to cause a denial of service (daemon crash) via a TFTP read (RRQ) request, aka opcode 1, a related issue to CVE-2013-0145.

Frequently asked questions

What is CVE-2021-44429?: Serva 4.4.0 allows remote attackers to cause a denial of service (daemon crash) via a TFTP read (RRQ) request, aka opcode 1, a related issue to CVE-2013-0145.
How severe is CVE-2021-44429?: CVE-2021-44429 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 none, integrity none, and availability high.
Is CVE-2021-44429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44429?: CVE-2021-44429 affects Vercot Serva. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-44429?: 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-2021-44429 published?: CVE-2021-44429 was published on 2021-11-29 and last updated on 2026-06-17.

References

https://packetstormsecurity.com/files/165058/Serva-4.4.0-TFTP-Remote-Buffer-Overflow.html

Affected products (1)

cpe:2.3:a:vercot:serva:4.4.0:*:*:*:*:*:*:*

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