Security readout for executives and security teams
Plain-English summary
CVE-2018-25103 is a lighttpd request-parsing memory safety issue affecting versions up to 1.4.50. A remote unauthenticated requester may cause lighttpd to read invalid memory from the same request context. The published impact is limited confidentiality exposure, not system takeover or service disruption.
Executive priority
Treat this as a moderate remediation item. It is remotely reachable and unauthenticated, but the cited impact is limited to low confidentiality exposure. Fix exposed and embedded instances during normal vulnerability management unless business context makes the hosted data unusually sensitive.
Technical view
The issue is a CWE-416 use-after-free in lighttpd <= 1.4.50 request parsing. The CVSS 3.1 vector is network reachable, low complexity, no privileges, no user interaction, unchanged scope, with low confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is most likely where lighttpd <= 1.4.50 serves public or internal HTTP traffic, including embedded, appliance, or IoT environments that bundle lighttpd. Confirm by version inventory, package manifests, SBOMs, and vendor advisories for packaged firmware.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. It indicates remote reachability and low attack complexity, but also states reads are from memory used in the same request, not other requests.
Researcher notes
The available description narrows memory exposure to invalid pointers within the same request, which reduces conclusions about cross-request data leakage. The bundle includes fixing commits, but no explicit exploit evidence. Validate fixed-version mapping from lighttpd or downstream vendor advisories before closing findings.
Mitigation direction
- Upgrade lighttpd beyond the affected <= 1.4.50 range using vendor-supported packages.
- Check lighttpd and device vendor advisories for the exact fixed release path.
- Prioritize internet-facing and appliance-bundled lighttpd instances first.
- Restrict access to exposed lighttpd services where upgrades require maintenance windows.
- Track firmware vendors separately when lighttpd is embedded in products.
Validation and detection
- Inventory lighttpd versions across servers, containers, appliances, and firmware images.
- Confirm whether any detected instance reports version 1.4.50 or earlier.
- Review SBOMs and package manifests for bundled lighttpd components.
- Verify vendor advisory status for appliances that do not expose package versions.
- Document exceptions with compensating controls and planned remediation dates.
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-416: 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-2018-25103 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://blogvdoo.wordpress.com/2018/11/06/giving-back-securing-open-source-iot-projects/#more-736CVE reference
- https://www.runzero.com/blog/lighttpd/CVE reference
- https://github.com/lighttpd/lighttpd1.4/commit/df8e4f95614e476276a55e34da2aa8b00b1148e9CVE reference
- https://github.com/lighttpd/lighttpd1.4/commit/d161f53de04bc826ce1bdaeb3dce2c72ca50a3f8CVE reference
- https://9443417.fs1.hubspotusercontent-na1.net/hubfs/9443417/Security%20Advisories/2024/AMI-SA-2024002.pdfCVE reference
- https://www.kb.cert.org/vuls/id/312260CVE reference
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.