CVE-2018-0739

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 19%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
19%
EPSS %ILE
97th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 27, 2018

Last Modified

November 21, 2024

References (68)

Vendor Advisories for CVE-2018-0739(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuopenssl (1.0.1-4ubuntu5.40) @ precise2026-05-28ubuntu
ubuntuopenssl (1.0.2g-1ubuntu4.11) @ xenial2026-05-28ubuntu
redhatopenssl2019-07-09redhat
redhattomcat-native-0:1.2.17-19.redhat_19.ep7.el72019-07-09redhat
redhatjbcs-httpd24-openssl-1:1.0.2n-14.jbcs.el72019-02-18redhat
redhatovmf-0:20180508-3.gitee3198e672e2.el72018-10-30redhat
redhatopenssl-1:1.0.2k-16.el72018-10-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(18 across 13 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
libtomcrypt—
  • every version up to 1.18.2-1: fixed in 1.18.2-1
—
openssl—
  • every version up to 1.1.0h-1: fixed in 1.1.0h-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
libtomcrypt—
  • every version up to 1.18.2-1: fixed in 1.18.2-1
—
openssl—
  • every version up to 1.1.0h-1: fixed in 1.1.0h-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
libtomcrypt—
  • every version up to 1.18.2-1: fixed in 1.18.2-1
—
openssl—
  • every version up to 1.1.0h-1: fixed in 1.1.0h-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
libtomcrypt—
  • every version up to 1.18.2-1: fixed in 1.18.2-1
—
openssl—
  • every version up to 1.1.0h-1: fixed in 1.1.0h-1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
openssl1.1.0f-3, 1.1.0f-3+deb9u1
  • every version up to 1.1.0f-3+deb9u2: fixed in 1.1.0f-3+deb9u2
—
openssl1.01.0.2l-2, 1.0.2l-2+deb9u1, 1.0.2l-2+deb9u2
  • every version up to 1.0.2l-2+deb9u3: fixed in 1.0.2l-2+deb9u3
—
Alpine:v3.3(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Alpine:v3.4(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Alpine:v3.5(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Alpine:v3.6(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Alpine:v3.7(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • 1.0.2b up to 1.0.2o-r0: fixed in 1.0.2o-r0
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
openssl1.0.1e-2 ... 1.0.1t-1+deb7u3 (47 versions)
  • every version up to 1.0.1t-1+deb7u4: fixed in 1.0.1t-1+deb7u4
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
openssl1.0.1k-3 ... 1.0.1t-1+deb8u7 (14 versions)
  • every version up to 1.0.1t-1+deb8u8: fixed in 1.0.1t-1+deb8u8
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 158 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
  2. 2026-10-08 16:36 UTCEPSS rescore
  3. 2026-10-07 23:41 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
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  8. 2026-09-30 14:59 UTCEPSS rescore
  9. 2026-09-30 09:50 UTCEG score recompute
  10. 2026-09-29 07:15 UTCOSV refresh
  11. 2026-09-28 13:45 UTCEPSS rescore
  12. 2026-09-27 13:40 UTCEPSS rescore
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  14. 2026-09-26 15:53 UTCEPSS rescore
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  20. 2026-09-19 15:36 UTCEPSS rescore
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  24. 2026-09-12 14:56 UTCEPSS rescore
  25. 2026-09-11 09:31 UTCEPSS rescore
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  1. 2026-09-09 13:23 UTCOSV refresh
  2. 2026-09-07 15:56 UTCEPSS rescore
  3. 2026-09-05 15:24 UTCEPSS rescore
  4. 2026-09-04 13:56 UTCEPSS rescore
  5. 2026-09-04 05:02 UTCEPSS rescore
  6. 2026-09-02 14:07 UTCEPSS rescore
  7. 2026-09-02 14:07 UTCEPSS rescore
  8. 2026-08-30 19:13 UTCEPSS rescore
  9. 2026-08-28 21:36 UTCEPSS rescore
  10. 2026-08-27 14:21 UTCEPSS rescore
  11. 2026-08-26 14:41 UTCEPSS rescore
  12. 2026-08-25 13:44 UTCEPSS rescore
  13. 2026-08-23 00:14 UTCEPSS rescore
  14. 2026-08-22 20:07 UTCOSV refresh
  15. 2026-08-21 23:44 UTCEPSS rescore
  16. 2026-08-19 16:59 UTCEPSS rescore
  17. 2026-08-18 13:43 UTCEPSS rescore
  18. 2026-08-16 14:51 UTCEPSS rescore
  19. 2026-08-16 02:10 UTCEPSS rescore
  20. 2026-08-15 01:26 UTCEPSS rescore
  21. 2026-08-12 13:46 UTCEPSS rescore
  22. 2026-08-09 13:42 UTCEPSS rescore
  23. 2026-08-08 16:32 UTCEPSS rescore
  24. 2026-08-07 16:22 UTCEPSS rescore
  25. 2026-08-07 00:04 UTCOSV refresh
  26. 2026-08-06 13:42 UTCEPSS rescore
  27. 2026-08-06 13:42 UTCEPSS rescore
  28. 2026-08-05 19:13 UTCEPSS rescore
  29. 2026-08-02 02:23 UTCEPSS rescore
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  32. 2026-07-30 16:24 UTCEPSS rescore
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  35. 2026-07-26 14:51 UTCEPSS rescore
  36. 2026-07-26 14:51 UTCEPSS rescore
  37. 2026-07-23 14:15 UTCEPSS rescore
  38. 2026-07-23 01:31 UTCEG score recompute
  39. 2026-07-22 22:11 UTCEG score recompute
  40. 2026-07-22 14:04 UTCEPSS rescore
  41. 2026-07-21 15:21 UTCEPSS rescore
  42. 2026-07-21 15:18 UTCOSV refresh
  43. 2026-07-20 17:04 UTCEPSS rescore
  44. 2026-07-20 17:04 UTCEPSS rescore
  45. 2026-07-19 14:28 UTCEPSS rescore
  46. 2026-07-19 14:28 UTCEPSS rescore
  47. 2026-07-19 02:26 UTCEPSS rescore
  48. 2026-07-19 02:26 UTCEPSS rescore
  49. 2026-07-18 10:01 UTCEPSS rescore
  50. 2026-07-16 16:59 UTCEPSS rescore
  51. 2026-07-16 16:59 UTCEPSS rescore
  52. 2026-07-15 16:55 UTCEPSS rescore
  53. 2026-07-15 16:54 UTCEPSS rescore
  54. 2026-07-15 01:56 UTCEPSS rescore
  55. 2026-07-15 01:56 UTCEPSS rescore
  56. 2026-07-13 22:26 UTCEPSS rescore
  57. 2026-07-13 22:26 UTCEPSS rescore
  58. 2026-07-12 05:43 UTCEPSS rescore
  59. 2026-07-11 08:24 UTCEPSS rescore
  60. 2026-07-09 19:06 UTCEPSS rescore
  61. 2026-07-08 15:11 UTCEPSS rescore
  62. 2026-07-07 13:42 UTCEPSS rescore
  63. 2026-07-06 16:24 UTCEPSS rescore
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  65. 2026-07-06 02:20 UTCEPSS rescore
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  67. 2026-07-05 02:27 UTCEPSS rescore
  68. 2026-07-04 11:26 UTCOSV refresh
  69. 2026-07-02 16:54 UTCEPSS rescore
  70. 2026-07-01 15:03 UTCEPSS rescore
  71. 2026-06-29 14:03 UTCEPSS rescore
  72. 2026-06-28 14:04 UTCEPSS rescore
  73. 2026-06-28 04:53 UTCEPSS rescore
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  75. 2026-06-27 03:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-0739?
CVE-2018-0739 is a medium vulnerability published on March 27, 2018. Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so…
When was CVE-2018-0739 disclosed?
CVE-2018-0739 was first published on March 27, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0739 actively exploited?
CVE-2018-0739 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-0739?
CVE-2018-0739 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2018-0739?
A fix for CVE-2018-0739 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2018-0739 are linked in the Vendor Advisories panel on this page.

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