CVE-2015-4555

HIGHCVSS v2 · 7.57.5
EchelonGraph scoreLOW confidence

“—” beside the score: it is equal to NVD's CVSS v2 base score.

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — NVD rates that HIGH (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 4.6% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: NVD CVSS v2.0
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4.6%CVSS v2: 7.5Exploit: None knownExposed services: Not assessed

No fix has been recorded since the CVE record was published in 2015 — use a compensating control (WAF / firewall / segmentation) and check the vendor's advisory.

The CVE record's description, written by its CNA (MITRE Corporation), states the affected versions: "Buffer overflow in the HTTP administrative interface in TIBCO Rendezvous before 8.4.4, Rendezvous Network Server before 1.1.1, Substation ES before 2.9.0, and Messaging Appliance before 8.7.2 allows remote attackers to…" No release containing a fix is confirmed on record.

Buffer overflow in the HTTP administrative interface in TIBCO Rendezvous before 8.4.4, Rendezvous Network Server before 1.1.1, Substation ES before 2.9.0, and Messaging Appliance before 8.7.2 allows remote attackers to cause a denial of service or possibly execute arbitrary code via unspecified vectors, related to the Rendezvous Daemon (rvd), Routing Daemon (rvrd), Secure Daemon (rvsd), Secure Routing Daemon (rvsrd), Gateway Daemon (rvgd), Daemon Adapter (rvda), Cache (rvcache), Agent (rva), and Relay Agent (rvrad) components.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5HIGHlow confidence
EG Risk
36
EG Risk 36/100

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)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation4.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). 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: No fix has been recorded since the CVE record was published in 2015. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and check the vendor's advisory for a fix.
EPSS PROB
4.6%
EPSS %ILE
91st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix has been recorded since the CVE record was published in 2015. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and check the vendor's advisory for a fix.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). 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

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 30, 2015

Last Modified

May 6, 2026

References (3)

Data Freshness Timeline

(refreshed 8× in last 7d / 22× 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 90 of 145 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. 10 repeat rows among the latest 100 are merged into the row they repeat. The 55 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:27 UTCEPSS rescoreEPSS 4.6% · 91st percentile
  2. 2026-10-12 01:15 UTCEG score recompute
  3. 2026-10-11 13:40 UTCEPSS rescoreEPSS 4.6% · 91st percentile
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  14. 2026-09-30 09:04 UTCEG score recompute
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  1. 2026-09-07 15:56 UTCEPSS rescoreEPSS 4.6% · 90th percentile
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  31. 2026-07-26 13:54 UTCEG score recomputeFirst assessed: 7.5 HIGH
  32. 2026-07-24 14:13 UTCEPSS rescoreEPSS 4.6% · 90th percentile
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  34. 2026-07-23 01:18 UTCEG score recompute
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Frequently asked(4)

What is CVE-2015-4555?
CVE-2015-4555 is a high-severity vulnerability; its CVE record was published on August 30, 2015. Buffer overflow in the HTTP administrative interface in TIBCO Rendezvous before 8.4.4, Rendezvous Network Server before 1.1.1, Substation ES before 2.9.0, and Messaging Appliance before 8.7.2 allows remote attackers to cause a denial of service or possibly execute arbitrary code via unspecified…
When was CVE-2015-4555 made public?
CVE-2015-4555 was made public on August 25, 2015: 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 August 30, 2015. EchelonGraph's copy of the record carries a last-modified date of May 6, 2026; the record at its source may have been updated since.
Is CVE-2015-4555 actively exploited?
CVE-2015-4555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.6% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
How do I remediate CVE-2015-4555?
No fix for CVE-2015-4555 has been recorded since its CVE record was published in 2015. Restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and check the vendor's advisory for a fix. The CVE record's description, written by its CNA (MITRE Corporation), states the affected versions: "Buffer overflow in the HTTP administrative interface in TIBCO Rendezvous before 8.4.4, Rendezvous Network Server before 1.1.1, Substation ES before 2.9.0, and Messaging Appliance before 8.7.2 allows remote attackers to…" No release containing a fix is confirmed on record.

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