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CVE Record

CVE-2018-19879: An issue was discovered in /cgi-bin/luci on Teltonika RTU9XX (e.g., RUT950) R_31.04.89 before R_00.05.00.5...

An issue was discovered in /cgi-bin/luci on Teltonika RTU9XX (e.g., RUT950) R_31.04.89 before R_00.05.00.5 devices. The authentication functionality is not protected from automated tools used to make login attempts to the application. An anonymous attacker has the ability to make unlimited login attempts with an automated tool. This ability could lead to cracking a targeted user's password.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Certain Teltonika RTU9XX routers, including RUT950, allowed unlimited automated login attempts against the LuCI web interface. If an attacker can reach that interface, weak or reused administrator passwords could be guessed, exposing router control and connected network traffic.

Executive priority

Treat as high priority for remote sites, industrial networks, or branches using affected Teltonika routers. The vulnerability can turn weak passwords into device compromise, but urgency is lower if management access is tightly isolated.

Technical view

CVE-2018-19879 affects /cgi-bin/luci authentication on Teltonika RTU9XX firmware R_31.04.89 before R_00.05.00.5. The login function lacked protection against automated attempts, allowing anonymous repeated password guessing. CVSS 3.0 is 7.1 with adjacent-network attack vector and low complexity.

Likely exposure

Exposure is most likely where Teltonika RTU9XX web administration is reachable by untrusted LAN, Wi-Fi, VPN, or adjacent-network users. The provided data does not prove internet exposure by default.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation evidence. Practical risk depends on interface reachability and password strength; the issue enables credential guessing rather than direct unauthenticated takeover.

Researcher notes

Evidence identifies missing automated-login protection, not a memory corruption or command execution bug. The affected structured CPE data is incomplete in the bundle, so validation should rely on model, firmware version, and vendor release information.

Mitigation direction

  • Upgrade affected RTU9XX firmware to R_00.05.00.5 or later per vendor guidance.
  • Restrict LuCI administrative access to trusted management networks only.
  • Use strong, unique administrator passwords on affected routers.
  • Review vendor firmware notes before applying production updates.
  • Monitor for repeated failed login attempts against /cgi-bin/luci.

Validation and detection

  • Inventory Teltonika RTU9XX devices and record firmware versions.
  • Confirm whether any device runs R_31.04.89 or earlier affected builds.
  • Check whether /cgi-bin/luci is reachable from untrusted adjacent networks.
  • Review authentication logs for unusual repeated failures.
  • Verify updated devices report R_00.05.00.5 or later.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2018-19879 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.1CVSS 3.0HighCVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:N2.83.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

7.1High
CVSS 3.0 vector shape for CVE-2018-19879Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AC:L/AV:A/A:L/C:L/I:L/PR:N/S:C/UI:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.