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From The CircuitryVerified tech news, cross-checked.How we verify →
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Verification
VERIFIEDConfidence: HIGH
Source identified
Claims cross-referenced
No discrepancies found
Fact-check summary

VulDB disclosed the D-Link DIR-878 heap overflow (CVE-2026-124560) in the HNAP GetCAPTCHAsetting handler; details corroborated by vulnerability databases and CVE aggregators.

1 caveat
  • ▲Article attributes the CVE to NVD as source/CNA, but VulDB is the actual CNA and primary reporter.
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Home/Security/Critical heap overflow flaw hits D-Link DIR-878 router
VERIFIEDBy Xavier Rivera·Monday, November 9, 2026 at 3:28 PM AST·1 min read

Critical heap overflow flaw hits D-Link DIR-878 router

A critical heap-based buffer overflow affects the D-Link DIR-878 on firmware 1.20B05 through the HNAP Handler. The flaw allows remote unauthenticated attacks and has a public exploit available.

Source:NVD
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Critical heap overflow flaw hits D-Link DIR-878 router
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TL;DRAI · 60 sec read

A critical heap overflow flaw affects the D-Link DIR-878 router on firmware 1.20B05. The bug sits in the HNAP Handler’s GetCAPTCHAsetting function inside bin/prog.cgi; unauthenticated attackers can manipulate the uid argument to overflow the heap over the network. VulDB assigned a CVSS 3.1 score of 9.8, and public exploit code is already available.

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A critical vulnerability has been disclosed in the D-Link DIR-878 router running firmware version 1.20B05.

The flaw resides in the HNAP Handler component. It affects the GetCAPTCHAsetting function inside the bin/prog.cgi file. An attacker can manipulate the uid argument to trigger a heap-based buffer overflow.
Remote exploitation is possible without authentication.

Remote exploitation is possible without authentication. The attack requires no user interaction and can be launched over the network. The vulnerability carries a CVSS 3.1 score of 9.8 from the CNA.
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VulDB as the CNA assigned scores. Version 2.0 received 10, version 3.1 received 9.8, and version 4.0 received 9.3 (Critical). NVD has not scored this CVE.

An exploit has already been published. The code is publicly available and could be used by attackers.
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No patch is expected. The CVE record says the DIR-878 is end-of-life and no longer supported by D-Link, so no fixed firmware is listed. Details come from the CVE.org and NVD records for CVE-2026-124560.
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