Security readout for executives and security teams
Plain-English summary
CVE-2018-9860 affects Botan, a cryptography library. Malformed TLS-CBC traffic could make a receiving service read beyond a record buffer, then fail authentication and close the connection. The stated impact is denial of service only; the source says no information leak occurs.
Executive priority
Treat this as a targeted availability risk, not a confidentiality breach based on the provided sources. Prioritize internet-facing or high-availability services using affected Botan versions, especially where TLS-CBC remains enabled.
Technical view
In Botan 1.11.32 through 2.x before 2.6.0, an off-by-one error in malformed TLS-CBC ciphertext handling can include exactly 64K bytes after the record buffer in HMAC computation. The MAC comparison then fails and the connection closes, causing denial of service without disclosed data leakage.
Likely exposure
Exposure is most likely in applications, appliances, or services that embed Botan versions 1.11.32 through 2.x before 2.6.0 and receive TLS-CBC traffic. The source bundle does not identify specific downstream products or distributions.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV. The issue was associated with OSS-Fuzz and requires malformed TLS-CBC ciphertext reaching a vulnerable receiving endpoint.
Researcher notes
The key boundary is the CVE statement that the over-read affects HMAC computation, the MAC fails, and the connection closes. Do not infer data exposure or broader memory disclosure from the over-read without additional evidence.
Mitigation direction
- Upgrade Botan to 2.6.0 or later where affected versions are present.
- Apply vendor or distribution updates for products bundling Botan.
- Review Botan security guidance for product-specific remediation details.
- Reduce reliance on TLS-CBC cipher suites where policy and compatibility allow.
Validation and detection
- Inventory SBOMs, package manifests, and embedded libraries for Botan versions.
- Verify runtime-linked Botan versions on externally reachable TLS services.
- Identify services that can receive TLS-CBC traffic using Botan.
- Review logs for abnormal TLS connection closures or denial-of-service symptoms.
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-2018-9860 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://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7434CVE reference · x_refsource_MISC
- https://botan.randombit.net/security.htmlCVE 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.