CVE-2021-29063Public exploitNetwork attack vector

Process hang via complex-number regex backtracking

Published Jun 21, 2021 · Updated Aug 3, 2024

Regular expression denial of service in mpmath 1.0.0 through 1.2.1 allows attackers to hang a calling process via a crafted string. The get_complex pattern in ctx_mp.py applies overlapping optional digit and decimal matches to complex-number text, causing excessive backtracking on invalid input. The flaw is reached only when an application passes attacker-controlled text to mpmathify, so exposure and hang duration depend on the consuming application.

CVSS severity7.5
High
EPSS probability4.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in mpmath 1.0.0 through 1.2.1 allows attackers to hang a calling process via a crafted string. The get_complex pattern in ctx_mp.py applies overlapping optional digit and decimal matches to complex-number text, causing excessive backtracking on invalid input. The flaw is reached only when an application passes attacker-controlled text to mpmathify, so exposure and hang duration depend on the consuming application.

The record

CVE
CVE-2021-29063
Published
Jun 21, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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