Security readout for executives and security teams
Plain-English summary
This CVE describes a remote code execution flaw in Steam authentication handling for several Call of Duty titles. A malformed authentication request could overflow a buffer because a size check was missing. The source bundle does not provide CVSS, vendor patch notes, or evidence of active exploitation.
Executive priority
Treat this as high priority only if the organization hosts or manages affected legacy Call of Duty services. For most enterprises, urgency is low unless those assets exist.
Technical view
SV_SteamAuthClient reads authBlob data into a buffer without a size check in listed Call of Duty games before 2015-08-11. The CVE description says this can allow code execution on the remote target machine when a Steam authentication request is sent.
Likely exposure
Exposure is most likely where legacy multiplayer game installations or servers for the listed Call of Duty titles remain reachable and are older than 2015-08-11.
Exploitation context
CISA KEV is false in the bundle. Public GitHub references are listed for Steam-auth RCE research, but the provided evidence does not establish active exploitation in the wild.
Researcher notes
The bundle lacks CVSS, CWE, detailed affected version ranges, and vendor remediation text. Analysis should stay tied to the CVE description and referenced repositories, with no assumption of current exploitation.
Mitigation direction
- Inventory listed Call of Duty installations and multiplayer servers.
- Remove or isolate builds older than 2015-08-11.
- Check Activision, Steam, and hosting-provider guidance for supported updates.
- Restrict network exposure for legacy game services.
- Retire unsupported servers where update status cannot be verified.
Validation and detection
- Confirm whether any listed game title is deployed or hosted.
- Verify build dates are not older than 2015-08-11.
- Review ingress exposure to Steam authentication traffic paths.
- Check logs for unusual authentication failures or crashes.
- Document unsupported legacy hosts as residual risk.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-20817 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/RektInator/cod-steamauth-rceCVE reference · x_refsource_MISC
- https://github.com/momo5502/cod-exploits/tree/master/steam-authCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.