CVE-2026-1143: A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513

This month

HIGH 8.8MITIGATE

CVE-2026-1143 is a high-severity flaw (CVSS 8.8) affecting a3700r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513. This affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ssid can lead to buffer overflow. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2026-01-19
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: totolink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-19 07:16 UTCPublished CVE record published
2026-06-17 10:15 UTCUpdated Record last modified

totolink a3700r firmware MITIGATE

Affected: 9.1.2u.5822_b20200513

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.1.2u.5822_b20200513

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1143?

a3700r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-1143 being exploited?

CVE-2026-1143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1143 affect?

CVE-2026-1143 affects a3700r firmware. Severity is high (CVSS 8.8). A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513. This affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ssid can lead to buffer overflow. The attack m

How urgent is CVE-2026-1143?

Priority 50/100. High severity; Public exploit reference

Related CVEs

CVE-2025-3675 MEDIUM 5.3 MITIGATE A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513
CVE-2025-3674 MEDIUM 5.3 MITIGATE A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513
CVE-2025-3668 MEDIUM 5.3 MITIGATE A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513
CVE-2025-3667 MEDIUM 5.3 MITIGATE A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513
CVE-2025-3666 MEDIUM 5.3 MITIGATE A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513 and classified as critical

References

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