CVE-2021-3125

Q: How do I fix CVE-2021-3125?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2021-3125 being actively exploited?

Not that we know of. CVE-2021-3125 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.

Q: How severe is CVE-2021-3125?

CVE-2021-3125 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-3125 affect?

Published advisories record a fix for tl-xdr1850 firmware (NVD), tl-xdr1860 firmware (NVD), tl-xdr3230 firmware (NVD), tl-xdr3250 firmware (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHEPSS 72th pctl

7.5

CVSS v3

NVD

Description

In TP-Link TL-XDR3230 < 1.0.12, TL-XDR1850 < 1.0.9, TL-XDR1860 < 1.0.14, TL-XDR3250 < 1.0.2, TL-XDR6060 Turbo < 1.1.8, TL-XDR5430 < 1.0.11, and possibly others, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

CWE-834

How to fix

Remediation Available

tl-xdr1850 firmwareNVD

Affected:< 1.0.9Fixed in:1.0.9CVE-2021-3125derived from NVD

tl-xdr1860 firmwareNVD

Affected:< 1.0.14Fixed in:1.0.14CVE-2021-3125derived from NVD

tl-xdr3230 firmwareNVD

Affected:< 1.0.12Fixed in:1.0.12CVE-2021-3125derived from NVD

tl-xdr3250 firmwareNVD

Affected:< 1.0.2Fixed in:1.0.2CVE-2021-3125derived from NVD

tl-xdr5430 firmwareNVD

Affected:< 1.0.11Fixed in:1.0.11CVE-2021-3125derived from NVD

tl-xdr6060 firmwareNVD

Affected:< 1.1.8Fixed in:1.1.8CVE-2021-3125derived from NVD

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.50%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory6

Related Vulnerabilities

Other CWE-834 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-35515	High	7.5	12%	-	Fix
CVE-2021-39924	High	7.5	4.9%	-	Fix
CVE-2023-1993	Medium	6.3	4.1%	-	Fix
CVE-2018-14342	High	7.5	3.7%	-	Fix
CVE-2020-14303	High	7.5	3.5%	-	Fix
CVE-2018-9133	Medium	6.5	3.2%	-	Fix

Common questions

How do I fix CVE-2021-3125?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-3125 being actively exploited?

Not that we know of. CVE-2021-3125 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.

How severe is CVE-2021-3125?

CVE-2021-3125 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-3125 affect?

Published advisories record a fix for tl-xdr1850 firmware (NVD), tl-xdr1860 firmware (NVD), tl-xdr3230 firmware (NVD), tl-xdr3250 firmware (NVD), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.