Security readout for executives and security teams
Plain-English summary
CVE-2019-11823 is a remotely reachable flaw in Synology Router Manager’s Network Center. Crafted network traffic can crash the affected application, causing denial of service. The cited sources identify SRM before 1.2.3-8017-2 as affected.
Executive priority
Prioritize remediation for internet-exposed or business-critical Synology routers. The main risk is service disruption, not data theft, but remote unauthenticated availability impact justifies timely patching.
Technical view
The issue is a CRLF injection vulnerability leading to an out-of-bounds read and application crash. CVSS 3.1 rates it 8.6: network attack vector, low complexity, no privileges, no user interaction, high availability impact, no confidentiality or integrity impact.
Likely exposure
Exposure is limited to Synology routers running SRM before 1.2.3-8017-2, particularly where affected router services receive traffic from untrusted networks.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Talos and Synology publicly documented the flaw, and the CVSS vector indicates remote, unauthenticated denial-of-service potential.
Researcher notes
Evidence supports a denial-of-service condition through CRLF injection in Network Center. Do not assume broader product impact beyond Synology SRM, or exploitation in the wild, from this source bundle alone.
Mitigation direction
- Upgrade SRM to 1.2.3-8017-2 or later per Synology guidance.
- Restrict affected router service exposure to trusted networks until upgraded.
- Monitor Synology advisories for device-specific fixed builds and support status.
- Investigate unexplained Network Center crashes or router availability disruptions.
Validation and detection
- Inventory Synology routers and record installed SRM versions.
- Confirm each SRM system is 1.2.3-8017-2 or later.
- Review whether affected services are reachable from untrusted networks.
- Check operational logs and uptime for unexplained application crashes.
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.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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.
Open ATT&CK lookupCVE-2019-11823 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
- High
- CVSS
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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 vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_20_11CVE reference · x_refsource_CONFIRM
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1051CVE 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.