5.5

CVE-2021-37519: memcached Out-of-bounds Write

Modified
AliasesUBUNTU-CVE-2021-37519DEBIAN-CVE-2021-37519
Published 03-02-2023Last modified 26-03-2025

Vulnerability summary

CVE-2021-37519 is a medium (CVSS 5.5) Out-of-bounds Write vulnerability in memcached. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 30.2% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.36%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Timeline

  1. 03-02-2023
    PublishedVulnerability first disclosed.
  2. 26-03-2025
    Last modifiedVulnerability information updated.

Description

Buffer Overflow vulnerability in authfile.c memcached 1.6.9 allows attackers to cause a denial of service via crafted authenticattion file.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Memcached

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • memcached< 1.6.10+dfsg-1
Memcached1 product
Ubuntu1 product
  • memcachedAll versions (No fix recorded)

3 vendors · 3 products

References

5 links