CVE-2019-6256

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A Denial of Service issue was discovered in the LIVE555 Streaming Media libraries as used in Live555 Media Server 0.93. It can cause an RTSPServer crash in handleHTTPCmd_TunnelingPOST, when RTSP-over-HTTP tunneling is supported, via x-sessioncookie HTTP headers in a GET request and a POST request within the same TCP session. This occurs because of a call to an incorrect virtual function pointer in the readSocket function in GroupsockHelper.cpp.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
2.4%
EPSS %ILE
83rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

January 14, 2019

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Oct 5, 2026
Patch available.
generic

[SECURITY] [DSA 4408-1] liblivemedia security update

https://www.debian.org/security/2019/dsa-4408
generic

LIVE555 Media Server: Multiple vulnerabilities (GLSA 202005-06) — Gentoo security

https://security.gentoo.org/glsa/202005-06
generic

Bugtraq: [SECURITY] [DSA 4408-1] liblivemedia security update

https://seclists.org/bugtraq/2019/Mar/22
genericMentions a patch (unverified)

[SECURITY] [DLA 1690-1] liblivemedia security update

https://lists.debian.org/debian-lts-announce/2019/02/msg00037.html
genericMentions a patch (unverified)

There is a Denial of service attack issue that can cause program to crash in LIVE555 Media Server version 0.93. · Issue #19 · rgaufman/live555 · GitHub

https://github.com/rgaufman/live555/issues/19

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuliblivemedia50 (2016.02.09-1ubuntu0.1~esm1) @ 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

(3 across 3 ecosystems)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
liblivemedia2004.11.11a-1 ... 2018.10.17-1 (86 versions)
  • every version up to 2018.11.26-1: fixed in 2018.11.26-1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
liblivemedia2014.01.13-1, 2014.01.13-1+deb8u1
  • every version up to 2014.01.13-1+deb8u2: fixed in 2014.01.13-1+deb8u2
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
liblivemedia2016.11.28-1, 2016.11.28-1+deb9u1
  • every version up to 2016.11.28-1+deb9u2: fixed in 2016.11.28-1+deb9u2
—

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 8× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 88 of 147 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 12 repeat rows among the latest 100 are merged into the row they repeat. The 59 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:42 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  11. 2026-09-30 10:26 UTCEG score recompute
  12. 2026-09-28 13:46 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  25. 2026-09-12 14:56 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  1. 2026-09-11 14:48 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  6. 2026-09-04 13:56 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  35. 2026-07-23 01:46 UTCEG score recompute
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  37. 2026-07-22 14:05 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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Frequently asked(5)

What is CVE-2019-6256?
CVE-2019-6256 is a critical-severity vulnerability; its CVE record was published on January 14, 2019. A Denial of Service issue was discovered in the LIVE555 Streaming Media libraries as used in Live555 Media Server 0.93. It can cause an RTSPServer crash in handleHTTPCmd_TunnelingPOST, when RTSP-over-HTTP tunneling is supported, via x-sessioncookie HTTP headers in a GET request and a POST request…
When was CVE-2019-6256 made public?
CVE-2019-6256 was made public on January 14, 2019: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on January 14, 2019. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2019-6256 actively exploited?
CVE-2019-6256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% probability of exploitation in the next 30 days (83rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-6256?
CVE-2019-6256 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-6256?
A fix for CVE-2019-6256 is available: update to the fixed version the vendor names in its advisory.

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