How severe is CVE-2022-37839?

CVE-2022-37839 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-2022-37839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-37839?

CVE-2022-37839 affects Totolink A860r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-37839?

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-2022-37839 published?

CVE-2022-37839 was published on 2022-09-06 and last updated on 2026-06-17.

CVE-2022-37839

CVE-2022-37839 is a critical-severity vulnerability in Totolink A860r 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Totolink A860r Firmware
Published: 2022-09-06
Last modified: 2026-06-17

Description

TOTOLINK A860R V4.1.2cu.5182_B20201027 is vulnerable to Buffer Overflow via Cstecgi.cgi.

Frequently asked questions

What is CVE-2022-37839?: TOTOLINK A860R V4.1.2cu.5182_B20201027 is vulnerable to Buffer Overflow via Cstecgi.cgi.
How severe is CVE-2022-37839?: CVE-2022-37839 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-2022-37839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-37839?: CVE-2022-37839 affects Totolink A860r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-37839?: 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-2022-37839 published?: CVE-2022-37839 was published on 2022-09-06 and last updated on 2026-06-17.

References

https://github.com/1759134370/iot/blob/main/TOTOLINK/A860R/5.md

Affected products (1)

cpe:2.3:o:totolink:a860r_firmware:4.1.2cu.5182_b20201027:*:*:*:*:*:*:*

More vulnerabilities in Totolink A860r Firmware

CVE-2022-40475 — Critical (CVSS 9.8): TOTOLINK A860R V4.1.2cu.5182_B20201027 was discovered to contain a command injection via the component…
CVE-2022-37843 — Critical (CVSS 9.8): In TOTOLINK A860R V4.1.2cu.5182_B20201027 in cstecgi.cgi, the acquired parameters are directly put into the system for…
CVE-2022-37842 — Critical (CVSS 9.8): In TOTOLINK A860R V4.1.2cu.5182_B20201027, the parameters in infostat.cgi are not filtered, causing a buffer overflow…
CVE-2022-37840 — Critical (CVSS 9.8): In TOTOLINK A860R V4.1.2cu.5182_B20201027, the main function in downloadfile.cgi has a buffer overflow vulnerability.
CVE-2022-25083 — Critical (CVSS 9.8): TOTOLink A860R V4.1.2cu.5182_B20201027 was discovered to contain a command injection vulnerability in the "Main"…
CVE-2022-36614 — High (CVSS 7.8): TOTOLINK A860R V4.1.2cu.5182_B20201027 was discovered to contain a hardcoded password for root at /etc/shadow.sample.

All CVEs affecting Totolink A860r Firmware →

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