CVE-2025-5215 is a high severity stack buffer overflow (CVSS 8.8) in the D-Link DCS-5020L camera, firmware 1.01_B2. The flaw sits in the websReadEvent function of /rame/ptdc.cgi. The record says the product is no longer supported, so no fix is coming. Replace the camera or isolate it.
What's affected
The CVE record names the D-Link DCS-5020L running firmware 1.01_B2. The vulnerable function is websReadEvent in the file /rame/ptdc.cgi, and the record says the Authorization argument is the input that overflows a stack buffer. The weaknesses are listed as CWE-119, CWE-121 (stack based buffer overflow) and CWE-787 (out of bounds write).
The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. It needs network access and a low privilege account, no user interaction, and it scores high on confidentiality, integrity and availability. The record says an exploit has been disclosed to the public. The CISA Known Exploited Vulnerabilities flag is false, and the record does not claim exploitation in the wild.
The record also states that the vulnerability only affects products that are no longer supported by the maintainer. That is the key point for planning. No patched firmware is expected, and you should not wait for one.
How to check if you're exposed
Read the model name on the label under the camera or in its web interface, and compare it with DCS-5020L. Then read the firmware version in the status page and compare it with 1.01_B2. The record only names that one build, so other builds are not proven safe, only unreported.
To find cameras you may have forgotten, look at your DHCP lease list and your network inventory for D-Link devices, and check your router for port forwards that point at them:
nmap -p 80,443,554 --open 192.168.1.0/24
Run that only against networks you own. Any camera answering on a web port and also reachable from the internet is the priority case. Check your router or firewall rules, and check whether UPnP created a forward without anyone choosing it.
What to do now
- Identify every DCS-5020L you run, with its firmware version and its location.
- Remove any port forward or UPnP mapping that exposes the camera web interface to the internet.
- Move the cameras to a separate VLAN that cannot reach business systems, and allow only the recorder or viewer that needs them.
- Change the camera passwords and remove unused accounts, because the vector needs a low privilege login.
- Replace the device with a supported model. An unsupported camera stays exposed however you configure it.
- Keep a note of the end of support state in your asset records so the next review does not rediscover it.
Why it matters
Stack overflows in embedded web servers are a recurring pattern. The device parses an HTTP header, here the Authorization value, into a fixed size buffer without checking the length. The sender controls the length, so the buffer can be overrun. On small devices with few memory protections, that can lead to code running on the camera.
A camera is also an unusual asset for this kind of bug. It sits inside the network, sees video, and is rarely monitored or patched. When the vendor has ended support, the only lasting fix is replacement. That is a procurement task as much as a security one, so raise it early.
Because the vector needs a login, strong and unique passwords are a real mitigation here, though not a cure. Segmentation does more, since it limits what a compromised camera can reach.
Quick check
Will D-Link release a patch for CVE-2025-5215?
The record says the affected product is no longer supported by the maintainer, so a patch should not be expected. Check the D-Link support pages in case the position has changed, then plan to replace the camera.
Is the flaw exploitable without an account?
The CVSS vector in the record requires a low privilege account. Do not rely on that alone, because many cameras keep default or shared passwords.
Sources
- Safeguard Gold record: https://gold.safeguard.sh/vulnerability/CVE-2025-5215
- CVE record data for CVE-2025-5215, including the VulDB entry and the D-Link site it lists. The VulDB page could not be retrieved while this post was written.
Last reviewed: 18 October 2026.
