CVE-2020-12740

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

tcprewrite in Tcpreplay through 4.3.2 has a heap-based buffer over-read during a get_c operation. The issue is being triggered in the function get_ipv6_next() at common/get.c.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity91% × 45%
Exploitation2% × 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
1.7%
EPSS %ILE
76th
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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 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

May 8, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jul 20, 2026
Patch available.
generic

[SECURITY] Fedora 31 Update: tcpreplay-4.3.3-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UOSEIQ3D2OONCJEVMGC2TYBC2QX4E5EJ/
generic

[SECURITY] Fedora 32 Update: tcpreplay-4.3.3-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4YAT4AGTHQKB74ETOQPJMV67TSDIAPOC/
generic

Heap overflow in get_ipv6_next() · Issue #576 · appneta/tcpreplay · GitHub

https://github.com/appneta/tcpreplay/issues/576

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntutcpreplay (3.4.4-2+deb8u1ubuntu0.1~esm2) @ xenial2026-05-27ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tcpreplay—
  • every version up to 4.3.3-1: fixed in 4.3.3-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
tcpreplay—
  • every version up to 4.3.3-1: fixed in 4.3.3-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tcpreplay—
  • every version up to 4.3.3-1: fixed in 4.3.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tcpreplay—
  • every version up to 4.3.3-1: fixed in 4.3.3-1
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 5× in last 7d / 26× 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 163 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-30 10:33 UTCEG score recompute
  6. 2026-09-27 13:40 UTCEPSS rescore
  7. 2026-09-27 04:15 UTCOSV refresh
  8. 2026-09-26 15:54 UTCEPSS rescore
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  24. 2026-09-07 15:57 UTCEPSS rescore
  25. 2026-09-07 13:18 UTCOSV refresh
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  1. 2026-09-06 13:44 UTCEPSS rescore
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  14. 2026-08-20 22:31 UTCOSV refresh
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  24. 2026-08-08 16:33 UTCEPSS rescore
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  26. 2026-08-06 13:43 UTCEPSS rescore
  27. 2026-08-05 19:14 UTCEPSS rescore
  28. 2026-08-05 14:10 UTCOSV refresh
  29. 2026-08-04 15:06 UTCEPSS rescore
  30. 2026-08-04 10:34 UTCEPSS rescore
  31. 2026-08-03 10:32 UTCEPSS rescore
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  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 14:15 UTCEPSS rescore
  42. 2026-07-23 01:49 UTCEG score recompute
  43. 2026-07-22 22:33 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-19 14:28 UTCEPSS rescore
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 12:54 UTCOSV refresh
  51. 2026-07-19 02:26 UTCEPSS rescore
  52. 2026-07-19 02:26 UTCEPSS rescore
  53. 2026-07-18 10:02 UTCEPSS rescore
  54. 2026-07-16 16:59 UTCEPSS rescore
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  68. 2026-07-01 22:01 UTCOSV refresh
  69. 2026-07-01 15:03 UTCEPSS rescore
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  74. 2026-06-28 04:54 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-12740?
CVE-2020-12740 is a critical vulnerability published on May 8, 2020. tcprewrite in Tcpreplay through 4.3.2 has a heap-based buffer over-read during a getc operation. The issue is being triggered in the function getipv6_next() at common/get.c.
When was CVE-2020-12740 disclosed?
CVE-2020-12740 was first published on May 8, 2020, 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-2020-12740 actively exploited?
CVE-2020-12740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-12740?
CVE-2020-12740 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2020-12740?
A fix for CVE-2020-12740 is available: update to the fixed version the vendor names in its advisory.

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