CVE-2018-1000159
CVE-2018-1000159 is a medium-severity vulnerability in Tlslite-ng Project Tlslite-ng with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-354.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (52nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-354
- Affected product: Tlslite-ng Project Tlslite-ng
- Published:
- Last modified:
Description
tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
Frequently asked questions
- What is CVE-2018-1000159?
- tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
- How severe is CVE-2018-1000159?
- CVE-2018-1000159 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2018-1000159 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-1000159?
- CVE-2018-1000159 affects Tlslite-ng Project Tlslite-ng. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-1000159?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2018-1000159 published?
- CVE-2018-1000159 was published on 2018-04-18 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:tlslite-ng_project:tlslite-ng:*:*:*:*:*:*:*:*
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