CVE-2023-28097

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.0% (61st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
7.5EG
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: 1.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.9 and 3.2.6, a malformed SIP message containing a large _Content-Length_ value and a specially crafted Request-URI causes a segmentation fault in OpenSIPS. This issue occurs when a large amount of shared memory using the -m flag was allocated to OpenSIPS, such as 10 GB of RAM. On the test system, this issue occurred when shared memory was set to 2362 or higher. This issue is fixed in versions 3.1.9 and 3.2.6. The only workaround is to guarantee that the Content-Length value of input messages is never larger than 2147483647.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.0%
EPSS %ILE
61st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
1.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (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; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

March 15, 2023

Last Modified

November 21, 2024

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 35× 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 92 of 197 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. 8 repeat rows among the latest 100 are merged into the row they repeat. The 105 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  2. 2026-10-22 16:31 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  3. 2026-10-21 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  4. 2026-10-21 04:30 UTCEG score recompute
  5. 2026-10-20 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  6. 2026-10-19 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  7. 2026-10-18 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  8. 2026-10-18 08:07 UTCEG score recompute
  9. 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  10. 2026-10-16 16:35 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  11. 2026-10-15 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  12. 2026-10-14 17:54 UTCOSV refresh
  13. 2026-10-14 16:29 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  14. 2026-10-13 16:29 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  15. 2026-10-12 18:30 UTCEG score recompute
  16. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  17. 2026-10-11 21:55 UTCEG score recompute
  18. 2026-10-11 13:45 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  19. 2026-10-10 19:57 UTCEPSS rescoreEPSS 1.0% · 60th percentile
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  25. 2026-10-04 23:20 UTCEPSS rescoreEPSS 1.0% · 60th percentile
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  1. 2026-10-03 14:23 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  2. 2026-10-02 16:23 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  3. 2026-10-01 19:47 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  4. 2026-09-30 16:20 UTCEG score recompute
  5. 2026-09-30 15:01 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  6. 2026-09-29 15:16 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  7. 2026-09-28 13:49 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  8. 2026-09-27 13:42 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  9. 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  10. 2026-09-24 14:01 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  11. 2026-09-23 18:22 UTCOSV refresh
  12. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  13. 2026-09-22 14:45 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  14. 2026-09-20 20:14 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  15. 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  16. 2026-09-13 16:44 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  17. 2026-09-12 14:58 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  18. 2026-09-11 14:50 UTCEPSS rescoreEPSS 1.0% · 59th percentile
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  20. 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.0% · 59th percentile
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  22. 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  23. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  24. 2026-09-04 13:58 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  25. 2026-09-04 12:59 UTCOSV refresh
  26. 2026-09-04 05:04 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  27. 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  28. 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  29. 2026-08-30 19:15 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  30. 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  31. 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.0% · 58th percentile
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  37. 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  38. 2026-08-20 22:53 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  39. 2026-08-19 17:02 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  40. 2026-08-18 13:46 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  41. 2026-08-18 00:26 UTCOSV refresh
  42. 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  43. 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.0% · 58th percentile
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  57. 2026-08-02 19:27 UTCOSV refresh
  58. 2026-08-02 02:24 UTCEPSS rescoreEPSS 1.0% · 58th percentile
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  60. 2026-07-30 16:26 UTCEPSS rescoreEPSS 1.0% · 58th percentile
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Frequently asked(5)

What is CVE-2023-28097?
CVE-2023-28097 is a high-severity vulnerability; its CVE record was published on March 15, 2023. OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.9 and 3.2.6, a malformed SIP message containing a large Content-Length value and a specially crafted Request-URI causes a segmentation fault in OpenSIPS. This issue occurs when a large amount of shared…
When was the CVE record for CVE-2023-28097 published?
The CVE record for CVE-2023-28097 was published on March 15, 2023. That is the record's publication date; the vulnerability itself may have been made public earlier. 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-2023-28097 actively exploited?
CVE-2023-28097 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (61st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-28097?
CVE-2023-28097 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-28097?
The CVE record for CVE-2023-28097 names the fix: "This issue is fixed in versions 3.1.9 and 3.2.6."

Dependency Blast Radius

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