NewsCompaniesFlawsGuides
Get the app

CVE-2019-20500

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in D-Link DWL-2600AP Access Point. For every flaw being used in attacks, see Exploited flaws; for D-Link’s, see D-Link flaws being used in attacks.

CVE-2019-20500 is a security flaw in D-Link DWL-2600AP Access Point, routers for homes and small offices. Attackers can run commands on D-Link DWL-2600AP Access Point. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 29 Jun 2023.[1]

D-Link DWL-2600AP Access Point is in things households have: home and small-office routers, so the fix matters at home as much as at work. D-Link has published a fix or advice.

Description

CISA calls it a command injection in D-Link DWL-2600AP Access Point. In its words: “D-Link DWL-2600AP access point contains an authenticated command injection vulnerability via the Save Configuration functionality in the Web interface, using shell metacharacters in the admin.cgi?action=config_save configBackup or downloadServerip parameter.”[1]

The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.[2]

It scores 7.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; D-Link’s advisory has them[3]. CISA names the product as D-Link DWL-2600AP Access Point.

Every device with D-Link DWL-2600AP Access Point needs the update.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 29 Jun 2023, 1,211 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 20 Jul 2023 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 97%. That’s in the top 1% of the flaws it scores.[4]

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

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

Fix

D-Link has published a fix or advice.[3] CISA’s required action: “Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.”[1]

  1. Update D-Link DWL-2600AP Access Point 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 7.8.[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 97%.[4]

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 OS command injection flaws

  • CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
  • CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
  • CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
  • CVE-2026-49869, Kestra OSS: OSS OS command injection ·
  • CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·

Added the same day

  • CVE-2021-25489, Samsung Mobile Devices: improper input validation ·
  • CVE-2021-25487, Samsung Mobile Devices: out-of-bounds read ·
  • CVE-2021-25395, Samsung Mobile Devices: race condition ·
  • CVE-2021-25394, Samsung Mobile Devices: race condition ·
  • CVE-2021-25372, Samsung Mobile Devices: improper boundary check ·

Every D-Link flaw on CISA’s list · Everything added in June 2023

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “D-Link DWL-2600AP Access Point Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 29 Jun 2023.
  2. ^ National Institute of Standards and Technology. “CVE-2019-20500 Detail”. National Vulnerability Database, published 5 Mar 2020.
  3. ^ D-Link. Advisories and fixes: supportannouncement.us.dlink.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.967, percentile 99.9, 31 Oct 2026.
  5. CVE Program. “CVE-2019-20500”. 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.