CVE-2011-4598

MEDIUMCVSS v2 · 4.34.3—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 4.3 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:N/I:N/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 2.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2.4%CVSS v2: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The handle_request_info function in channels/chan_sip.c in Asterisk Open Source 1.6.2.x before 1.6.2.21 and 1.8.x before 1.8.7.2, when automon is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted sequence of SIP requests.

CVSS v2.0 (legacy)
4.3MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
4.3MEDIUMlow confidence
EG Risk
25
EG Risk 25/100CISA 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
Severity43% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
2.4%
EPSS %ILE
83rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 unknown (not published for this CVE). 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

December 15, 2011

Last Modified

April 29, 2026

References (6)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
asterisk—
  • every version up to 1:1.8.8.0~dfsg-1: fixed in 1:1.8.8.0~dfsg-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
asterisk0.1.11-3 ... 1:1.8.7.1~dfsg-3 (144 versions)
  • every version up to 1:1.8.8.0~dfsg-1: fixed in 1:1.8.8.0~dfsg-1
—
Debian:5.0(1)
PackageVulnerable rangeFix by version rangeDependents
asterisk1:1.4.21.2~dfsg-3 ... 1:1.4.21.2~dfsg-3+lenny5 (6 versions)
  • every version up to 1:1.4.21.2~dfsg-3+lenny6: fixed in 1:1.4.21.2~dfsg-3+lenny6
—
Debian:6.0(1)
PackageVulnerable rangeFix by version rangeDependents
asterisk1:1.6.2.9-2, 1:1.6.2.9-2+squeeze1, 1:1.6.2.9-2+squeeze2, 1:1.6.2.9-2+squeeze3
  • every version up to 1:1.6.2.9-2+squeeze4: fixed in 1:1.6.2.9-2+squeeze4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 20× 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 81 of 127 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. 19 repeat rows among the latest 100 are merged into the row they repeat. The 46 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 19:54 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  2. 2026-10-09 20:00 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  3. 2026-10-08 16:34 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  4. 2026-10-07 23:38 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  5. 2026-10-06 15:10 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  6. 2026-10-05 17:37 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  7. 2026-10-04 23:16 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  8. 2026-09-30 21:40 UTCOSV refresh
  9. 2026-09-30 14:58 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  10. 2026-09-29 08:23 UTCEG score recompute
  11. 2026-09-28 13:44 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  12. 2026-09-27 13:39 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  13. 2026-09-26 15:52 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  14. 2026-09-24 13:57 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  15. 2026-09-20 20:08 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  16. 2026-09-16 13:58 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  17. 2026-09-15 03:04 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  18. 2026-09-13 16:40 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  19. 2026-09-12 14:54 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  20. 2026-09-12 03:10 UTCOSV refresh
  21. 2026-09-06 13:41 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  22. 2026-09-05 15:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  23. 2026-09-04 13:55 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  24. 2026-08-25 13:43 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  25. 2026-08-24 08:57 UTCOSV refresh
Show 56 more
  1. 2026-08-19 16:58 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  2. 2026-08-18 13:42 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  3. 2026-08-15 01:25 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  4. 2026-08-09 13:41 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  5. 2026-08-08 16:31 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  6. 2026-08-08 05:19 UTCOSV refresh
  7. 2026-08-06 13:41 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  8. 2026-08-05 19:12 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  9. 2026-08-04 15:04 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  10. 2026-08-01 04:10 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  11. 2026-07-30 01:26 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  12. 2026-07-26 13:44 UTCEG score recompute▲ 4.30
  13. 2026-07-23 14:14 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  14. 2026-07-23 01:06 UTCEG score recompute
  15. 2026-07-23 00:09 UTCEG score recompute
  16. 2026-07-22 22:24 UTCOSV refresh
  17. 2026-07-22 21:48 UTCEG score recompute
  18. 2026-07-22 14:03 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  19. 2026-07-21 15:21 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  20. 2026-07-20 17:03 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  21. 2026-07-19 02:25 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  22. 2026-07-18 10:00 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  23. 2026-07-16 16:58 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  24. 2026-07-15 16:54 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  25. 2026-07-15 01:55 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  26. 2026-07-13 22:25 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  27. 2026-07-13 06:08 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  28. 2026-07-11 08:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  29. 2026-07-08 15:10 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  30. 2026-07-06 16:23 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  31. 2026-07-06 02:19 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  32. 2026-07-05 17:29 UTCOSV refresh
  33. 2026-07-05 02:26 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  34. 2026-07-04 06:27 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  35. 2026-07-02 14:01 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  36. 2026-07-01 15:02 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  37. 2026-06-30 23:19 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  38. 2026-06-29 14:02 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  39. 2026-06-28 14:03 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  40. 2026-06-28 04:52 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  41. 2026-06-27 03:05 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  42. 2026-06-25 13:46 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  43. 2026-06-24 14:02 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  44. 2026-06-23 21:30 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  45. 2026-06-21 01:56 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  46. 2026-06-19 19:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  47. 2026-06-18 17:49 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  48. 2026-06-17 17:49 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  49. 2026-06-17 04:35 UTCOSV refresh
  50. 2026-06-16 17:49 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  51. 2026-06-15 17:44 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  52. 2026-06-14 23:14 UTCEPSS rescoreEPSS 0.6% · 70th percentile
  53. 2026-06-13 22:57 UTCEPSS rescoreEPSS 0.6% · 70th percentile
  54. 2026-06-12 23:08 UTCEPSS rescoreEPSS 0.6% · 70th percentile
  55. 2026-06-11 13:56 UTCEPSS rescoreEPSS 0.6% · 70th percentile
  56. 2026-06-10 22:14 UTCEPSS rescoreEPSS 0.6% · 70th percentile

Related CVEs(same product + same CWE)

Frequently asked(4)

What is CVE-2011-4598?
CVE-2011-4598 is a medium vulnerability published on December 15, 2011. The handlerequestinfo function in channels/chan_sip.c in Asterisk Open Source 1.6.2.x before 1.6.2.21 and 1.8.x before 1.8.7.2, when automon is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted sequence of SIP requests.
When was the CVE record for CVE-2011-4598 published?
The CVE record for CVE-2011-4598 was published on December 15, 2011. 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 April 29, 2026; the record at its source may have been updated since.
Is CVE-2011-4598 actively exploited?
CVE-2011-4598 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).
How do I remediate CVE-2011-4598?
A fix for CVE-2011-4598 is available: update to the fixed version the vendor names in its advisory.

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