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CVE-2013-5223

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in D-Link DSL-2760U. For every flaw being used in attacks, see Exploited flaws; for D-Link’s, see D-Link flaws being used in attacks.

CVE-2013-5223 is a security flaw in D-Link DSL-2760U, routers for homes and small offices. Attackers can run code in the browser of someone using D-Link DSL-2760U and act as them. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 25 Mar 2022.[1]

D-Link DSL-2760U is in things households have: home and small-office routers, so the fix matters at home as much as at work.

Description

CISA calls it a gateway cross-site scripting in D-Link DSL-2760U. In its words: “A cross-site scripting (XSS) vulnerability exists in the D-Link DSL-2760U gateway, allowing remote authenticated users to inject arbitrary web script or HTML.”[1]

The CVE record adds: “Multiple cross-site scripting (XSS) vulnerabilities in D-Link DSL-2760U Gateway (Rev. E1) allow remote authenticated users to inject arbitrary web script or HTML via the (1) ntpServer1 parameter to sntpcfg.cgi, username parameter to (2) ddnsmngr.cmd or (3) todmngr.tod, (4) TodUrlAdd parameter to urlfilter.cmd, (5) appName parameter to scprttrg.cmd, (6) fltName in an add action or (7) rmLst parameter in a remove action to scoutflt.cmd, (8) groupName parameter to portmapcfg.cmd, (9) snmpRoCommunity parameter to snmpconfig.cgi, (10) fltName parameter to scinflt.cmd, (11) PolicyName in an add action or (12) rmLst parameter in a remove action to prmngr.cmd, (13) ippName parameter to ippcfg.cmd, (14) smbNetBiosName or (15) smbDirName parameter to samba.cgi, or (16) wlSsid parameter to wlcfg.wl.”[2]

The underlying weakness is cross-site scripting (CWE-79), in MITRE’s list of common software weaknesses.

It scores 5.4 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it. CISA names the product as D-Link DSL-2760U.

Every device with D-Link DSL-2760U needs the update.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 25 Mar 2022, 3,048 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 15 Apr 2022 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 51%. That’s in the top 2% of the flaws it scores.[3]

CISA assesses it as not automatable: each attack takes some work.

CISA doesn’t say who was attacked, or how.

Fix

CISA’s required action: “Apply updates per vendor instructions.”[1]

  1. Update D-Link DSL-2760U now.Open the router’s app, or its admin page in a browser, and look for a firmware update. Then turn on automatic updates, so the next fix arrives on its own.
  2. If the maker has stopped updating it, replace it.Routers stop getting fixes after a few years, and attackers keep a list of the ones that did. If there’s no newer firmware, it won’t be fixed.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 5.4.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 51%.[3]

See also

Other D-Link flaws

  • CVE-2025-29635, D-Link DIR-823X: command injection ·
  • CVE-2022-37055, D-Link Routers: buffer overflow ·
  • CVE-2022-40799, D-Link DNR-322L: download of code without integrity check ·
  • CVE-2020-25079, D-Link DCS-2530L and DCS-2670L Devices: DCS-2530L and DCS-2670L command injection ·
  • CVE-2020-25078, D-Link DCS-2530L and DCS-2670L Devices: unspecified ·

Other cross-site scripting flaws

  • CVE-2026-42897, Microsoft: exchange server cross-site scripting ·
  • CVE-2025-48700, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
  • CVE-2025-66376, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
  • CVE-2025-68461, Roundcube Webmail: cross-site scripting ·
  • CVE-2021-26829, OpenPLC ScadaBR: cross-site scripting ·

Added the same day

  • CVE-2022-26318, WatchGuard Firebox and XTM Appliances: arbitrary code execution ·
  • CVE-2022-26143, Mitel MiCollab, MiVoice Business Express: access control ·
  • CVE-2022-21999, Microsoft Windows: print spooler privilege escalation ·
  • CVE-2021-42237, Sitecore XP: remote command execution ·
  • CVE-2021-22941, Citrix ShareFile: improper access control ·

Every D-Link flaw on CISA’s list · Everything added in March 2022

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “D-Link DSL-2760U Gateway Cross-Site Scripting Vulnerability”. Known Exploited Vulnerabilities Catalog, added 25 Mar 2022.
  2. ^ National Institute of Standards and Technology. “CVE-2013-5223 Detail”. National Vulnerability Database, published 19 Nov 2013.
  3. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.508, percentile 98.9, 31 Oct 2026.
  4. CVE Program. “CVE-2013-5223”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.