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CVE Record

CVE-2026-19977: EFM ipTIME A3004T Session Validation httpcon_check_session_url improper authentication

A vulnerability was detected in EFM ipTIME A3004T 14.19.0. The affected element is the function httpcon_check_session_url of the component Session Validation. Performing a manipulation results in improper authentication. Remote exploitation of the attack is possible. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

EFM ipTIME A3004T firmware 14.19.0 may allow an unauthenticated remote attacker to bypass session checks, potentially gaining administrative control and affecting confidentiality, integrity, and availability. The issue is rated CVSS 10.0. Public exploit material is referenced, but the supplied sources do not establish active attacks or identify a vendor fix.

Executive priority

Prioritize within 24 hours for exposed or business-critical devices. Remove management exposure immediately, investigate suspicious administrative activity, and establish an owner for vendor follow-up or replacement. Internal-only devices still require urgent inventory and containment because public exploit material is referenced and no confirmed fix is supplied.

Technical view

CVE-2026-19977 is a CWE-287 improper-authentication flaw in httpcon_check_session_url, part of the A3004T session-validation component. The reported attack is remote, requires no privileges or user interaction, and has low complexity. Available reporting also associates the bypass with arbitrary password reset. The supplied scope identifies only firmware 14.19.0.

Likely exposure

Exposure is most serious where an A3004T running firmware 14.19.0 has its management interface reachable from the internet or untrusted networks. Devices limited to trusted management networks have lower reachability, but remain vulnerable to attackers already present there. The bundle provides no deployment prevalence or exposure count.

Exploitation context

A public exploit reference exists, and the CVSS vector marks exploit maturity as proof-of-concept. However, CVE-2026-19977 is not listed as KEV in the supplied bundle, and no cited evidence confirms exploitation in the wild. Treat exploitation as feasible, not confirmed active.

Researcher notes

The assessment relies mainly on CVE/VulDB reporting and a linked public issue; vendor confirmation is absent. Reported impact is broad, but the bundle does not provide enough evidence to independently validate every claimed consequence. Avoid generalizing beyond EFM ipTIME A3004T firmware 14.19.0 until additional versions are documented.

Mitigation direction

  • Identify A3004T devices running firmware 14.19.0 immediately.
  • Block internet and untrusted-network access to device management interfaces.
  • Restrict administration to trusted hosts or a dedicated management network.
  • Check EFM guidance for fixed firmware; no fix is identified in the supplied sources.
  • Consider replacing or isolating affected devices if supported remediation remains unavailable.

Validation and detection

  • Confirm each device model and installed firmware version.
  • Determine whether management interfaces are reachable from internet or untrusted networks.
  • Review logs for unexpected administrative sessions, password resets, or configuration changes.
  • Verify administrator credentials and device configuration through trusted management access.
  • Recheck vendor guidance and the CVE record for remediation updates.
Prepared
Confidence
medium
Sources
6

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.

cwe · medium confidence lookup

CWE-287: Credential and account abuse lookup

Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-19977 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

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.

4CVSS vectors
6Timeline events
1ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: yesTechnical Impact: total

CVSS vector scores

4 official scores

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
10CVSS 4.0CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P——VulDB
10CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.96VulDB
10CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.96VulDB
10CVSS 2.0CriticalAV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR1010VulDB

Vulnerability scoring details

Base CVSS 4.0 score

10Critical
CVSS 4.0 vector shape for CVE-2026-19977Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineVulDB

    Advisory disclosed

  2. Source timelineVulDB

    VulDB entry created

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. Source timelineVulDB

    VulDB entry last update

  5. CVE publishedCVE Program

    The CVE record was published.

  6. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
EFMipTIME A3004T14.19.0Listed
Weakness

CWE details

CWE-287

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

CWE-287 · source CWE mapping

Improper Authentication

Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs